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Technical data sheet · PowerEdge 16G · 1U dual-socket

Dell PowerEdge R660Specifications, configurations & comparisons

The R660 is Dell’s 1U two-socket server for 4th and 5th Gen Intel Xeon Scalable, carrying the same 51-processor list and 32 DDR5 slots as the 2U R760 in less than half the height. This page maps everything Dell documents for it, and where the 1U chassis draws its lines: drive bays, PCIe slots, GPUs and the cooling rules for 300 W and 350 W processors.

1U Rack1 or 2 socketsXeon Max (HBM)4th Gen Xeon Scalable5th Gen Xeon ScalableiDRAC9
64cores per CPU128 per server · 5th Gen Xeon
8TBDDR5 maximum32 DIMM slots · 32 × 256 GB
16drive baysE3.S NVMe · or 10 + 2 rear × 2.5"
3GPUssingle-wide 75 W · A2 or L4
3PCIe slots2 × Gen5 or 3 × Gen4
1,800Wlargest PSU8 supply options, 1+1
Configure an R660 →Get a UK quoteRefurbished alternatives ↓

Every figure checked against the Dell PowerEdge R660 Technical Guide (June 2026, Rev. A01)

Dell PowerEdge R660 front view with ten 2.5-inch drive bays, the left control panel, and VGA, USB and power button at the right12
  1. 1Ten 2.5-inch drive bays
  2. 2Front VGA, USB 2.0 and iDRAC Direct micro-USB

Image: Dell Technologies

Form factor
1U Rack · 2 sockets
Processors
Xeon Max (HBM) · 4th Gen Xeon · 5th Gen Xeon
Memory
32 × DDR5 RDIMM · up to 8 TB
Drive bays
Up to 16 · 13 drive-bay layouts
Expansion
3 × PCIe · 1 × OCP 3.0
GPUs
Up to 3 · 2 listed
Boot
BOSS-N1
Management
iDRAC9
01 — Overview

The R660 at a glance

Our read of Dell’s documentation: where the R660 is strong, and the limits worth knowing before you spec one.

Strengths

  • The same 51 processors and 32 DDR5 slots as the 2U R760 in a 1U chassis, with up to 64 cores per socket and 8 TB of memory.
  • EDSFF E3.S Gen5 layouts put 16 NVMe bays in one rack unit, where the R650 stopped at ten 2.5-inch front bays.
  • Eight power supply options, from 700 W to 1800 W AC, plus −48 to −60 V DC and 277 VAC / 336 V HVDC units.
  • NEBS Level 3 and ETSI validation for a defined parts list, aimed at communications service providers’ telecom sites.
  • Direct Liquid Cooling is optional, and Dell’s main air-cooling matrix names it as the route for 350 W parts in the denser drive layouts.

Watch-outs

  • Air-cooled 350 W processors are limited to the no-backplane and 8 × 2.5-inch fronts at 30°C inlet; the 9480, 9470, 8470Q and 6458Q need liquid cooling in every layout.
  • No 3.5-inch drives at all — the R650’s 4 × 3.5-inch option did not carry over — and 2.5-inch storage tops out at ten front plus two rear bays.
  • Three PCIe slots at most, only two of them Gen5, and rear drives work with just two riser configurations.
  • GPUs stop at three single-wide 75 W cards, and three L4s bring processor TDP caps with them.
  • At 822.88 mm with the bezel it is 50.77 mm deeper than the R650, so check rack depth before a like-for-like swap.
Processors51 SKUs
Cores / CPU8–64
DIMM slots32
Drive layouts13
Max bays16
GPUsup to 3
PSU options8 · to 1,800 W
02 — Processors

51 supported processors, mapped

Dell lists 51 processors for the R660: 37 4th Gen Xeon Scalable and Xeon Max parts and 14 5th Gen parts. The chart plots each by cores and TDP. The list is identical to the R760’s, but in 1U the drive layout and cooling decide which of them a given chassis can actually run, so read the thermal notes before choosing anything above 250 W.

Processor landscape — cores × TDP

51 SKUs · 3 families
Dell PowerEdge R660: every supported processor by cores and TDP0816243240485664100 W150 W200 W250 W300 W350 WCores per processorIntel Xeon Max 9480 — 56 cores / 112 threads · 350 W · 1.9 GHz base · 113 MB cache · DDR5-4800Intel Xeon Max 9470 — 52 cores / 104 threads · 350 W · 2 GHz base · 105 MB cache · DDR5-4800Intel Xeon Max 9460 — 40 cores / 80 threads · 350 W · 2.2 GHz base · 98 MB cache · DDR5-4800Intel Xeon Max 9462 — 32 cores / 64 threads · 350 W · 2.7 GHz base · 75 MB cache · DDR5-4800Intel Xeon Platinum 8480+ — 56 cores / 112 threads · 350 W · 2 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8470Q — 52 cores / 104 threads · 350 W · 2.1 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8470 — 52 cores / 104 threads · 350 W · 2 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8471N — 52 cores / 104 threads · 300 W · 1.8 GHz base · 98 MB cache · DDR5-4800Intel Xeon Platinum 8470N — 52 cores / 104 threads · 300 W · 1.7 GHz base · 98 MB cache · DDR5-4800Intel Xeon Platinum 8468 — 48 cores / 96 threads · 350 W · 2.1 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8460Y+ — 40 cores / 80 threads · 300 W · 2 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8452Y — 36 cores / 72 threads · 300 W · 2 GHz base · 68 MB cache · DDR5-4800Intel Xeon Gold 6458Q — 32 cores / 64 threads · 350 W · 3.1 GHz base · 60 MB cache · DDR5-4800Intel Xeon Platinum 8462Y+ — 32 cores / 64 threads · 300 W · 2.8 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6454S — 32 cores / 64 threads · 270 W · 2.2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6430 — 32 cores / 64 threads · 270 W · 2.1 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6414U — 32 cores / 64 threads · 250 W · 2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6448Y — 32 cores / 64 threads · 225 W · 2.2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6438Y+ — 32 cores / 64 threads · 205 W · 2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6438N — 32 cores / 64 threads · 205 W · 2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6438M — 32 cores / 64 threads · 205 W · 2.2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6428N — 32 cores / 64 threads · 185 W · 1.8 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6421N — 32 cores / 64 threads · 185 W · 1.8 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 5420+ — 28 cores / 56 threads · 205 W · 2 GHz base · 53 MB cache · DDR5-4400Intel Xeon Gold 6442Y — 24 cores / 48 threads · 225 W · 2.6 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 5418Y — 24 cores / 48 threads · 185 W · 2 GHz base · 45 MB cache · DDR5-4400Intel Xeon Gold 5412U — 24 cores / 48 threads · 185 W · 2.1 GHz base · 45 MB cache · DDR5-4400Intel Xeon Gold 5418N — 24 cores / 48 threads · 165 W · 1.8 GHz base · 45 MB cache · DDR5-4400Intel Xeon Gold 5411N — 24 cores / 48 threads · 165 W · 1.9 GHz base · 45 MB cache · DDR5-4400Intel Xeon Silver 4416+ — 20 cores / 40 threads · 165 W · 2 GHz base · 38 MB cache · DDR5-4000Intel Xeon Gold 6444Y — 16 cores / 32 threads · 270 W · 3.5 GHz base · 45 MB cache · DDR5-4800Intel Xeon Gold 6426Y — 16 cores / 32 threads · 185 W · 2.6 GHz base · 38 MB cache · DDR5-4800Intel Xeon Gold 5416S — 16 cores / 32 threads · 150 W · 2 GHz base · 30 MB cache · DDR5-4400Intel Xeon Silver 4410Y — 12 cores / 24 threads · 150 W · 2 GHz base · 30 MB cache · DDR5-4000Intel Xeon Gold 6434 — 8 cores / 16 threads · 205 W · 3.7 GHz base · 23 MB cache · DDR5-4800Intel Xeon Gold 5415+ — 8 cores / 16 threads · 150 W · 2.9 GHz base · 23 MB cache · DDR5-4400Intel Xeon Bronze 3408U — 8 cores / 16 threads · 125 W · 1.8 GHz base · 23 MB cache · DDR5-4000Intel Xeon Platinum 8592+ — 64 cores / 128 threads · 350 W · 1.9 GHz base · 320 MB cache · DDR5-5600Intel Xeon Platinum 8580 — 60 cores / 120 threads · 350 W · 2 GHz base · 300 MB cache · DDR5-5600Intel Xeon Platinum 8568Y+ — 48 cores / 96 threads · 350 W · 2.3 GHz base · 300 MB cache · DDR5-5600Intel Xeon Platinum 8558U — 48 cores / 96 threads · 300 W · 2 GHz base · 260 MB cache · DDR5-4800Intel Xeon Platinum 8562Y+ — 32 cores / 64 threads · 300 W · 2.8 GHz base · 60 MB cache · DDR5-5600Intel Xeon Gold 6548N — 32 cores / 64 threads · 250 W · 2.8 GHz base · 60 MB cache · DDR5-5200Intel Xeon Gold 6548Y+ — 32 cores / 64 threads · 250 W · 2.5 GHz base · 60 MB cache · DDR5-5200Intel Xeon Gold 5512U — 28 cores / 56 threads · 185 W · 2.1 GHz base · 52.5 MB cache · DDR5-4800Intel Xeon Gold 6542Y — 24 cores / 48 threads · 250 W · 2.9 GHz base · 60 MB cache · DDR5-5200Intel Xeon Gold 6526Y — 16 cores / 32 threads · 195 W · 2.8 GHz base · 37.5 MB cache · DDR5-5200Intel Xeon Silver 4514Y — 16 cores / 32 threads · 150 W · 2 GHz base · 30 MB cache · DDR5-4400Intel Xeon Silver 4510 — 12 cores / 24 threads · 150 W · 2.4 GHz base · 30 MB cache · DDR5-4400Intel Xeon Gold 6534 — 8 cores / 16 threads · 195 W · 3.9 GHz base · 22.5 MB cache · DDR5-4800Intel Xeon Silver 4509Y — 8 cores / 16 threads · 125 W · 2.6 GHz base · 23 MB cache · DDR5-44008592+64 cores · 5.5 W/core — top SKU and most efficient
Xeon Max (HBM) 44th Gen Xeon Scalable 335th Gen Xeon Scalable 14Bubble size = L3 cache · hover a bubble for the full SKU

Processor explorer

filter · sort · compare
ProcessorCores / threadsBaseL3 cacheTDPW / coreMemory
Intel Xeon Platinum 8592+64 / 1281.9 GHz320 MB350 W5.5DDR5-5600
Intel Xeon Platinum 858060 / 1202 GHz300 MB350 W5.8DDR5-5600
Intel Xeon Max 9480 *56 / 1121.9 GHz113 MB350 W6.3DDR5-4800
Intel Xeon Platinum 8480+56 / 1122 GHz105 MB350 W6.3DDR5-4800
Intel Xeon Max 9470 *52 / 1042 GHz105 MB350 W6.7DDR5-4800
Intel Xeon Platinum 8470Q *52 / 1042.1 GHz105 MB350 W6.7DDR5-4800
Intel Xeon Platinum 847052 / 1042 GHz105 MB350 W6.7DDR5-4800
Intel Xeon Platinum 8471N52 / 1041.8 GHz98 MB300 W5.8DDR5-4800
Intel Xeon Platinum 8470N52 / 1041.7 GHz98 MB300 W5.8DDR5-4800
Intel Xeon Platinum 846848 / 962.1 GHz105 MB350 W7.3DDR5-4800
Intel Xeon Platinum 8568Y+48 / 962.3 GHz300 MB350 W7.3DDR5-5600
Intel Xeon Platinum 8558U48 / 962 GHz260 MB300 W6.3DDR5-4800
Intel Xeon Max 946040 / 802.2 GHz98 MB350 W8.8DDR5-4800
Intel Xeon Platinum 8460Y+40 / 802 GHz105 MB300 W7.5DDR5-4800
Intel Xeon Platinum 8452Y36 / 722 GHz68 MB300 W8.3DDR5-4800
Intel Xeon Max 946232 / 642.7 GHz75 MB350 W10.9DDR5-4800
Intel Xeon Gold 6458Q *32 / 643.1 GHz60 MB350 W10.9DDR5-4800
Intel Xeon Platinum 8462Y+32 / 642.8 GHz60 MB300 W9.4DDR5-4800
Intel Xeon Gold 6454S32 / 642.2 GHz60 MB270 W8.4DDR5-4800
Intel Xeon Gold 643032 / 642.1 GHz60 MB270 W8.4DDR5-4800
Intel Xeon Gold 6414U32 / 642 GHz60 MB250 W7.8DDR5-4800
Intel Xeon Gold 6448Y32 / 642.2 GHz60 MB225 W7.0DDR5-4800
Intel Xeon Gold 6438Y+32 / 642 GHz60 MB205 W6.4DDR5-4800
Intel Xeon Gold 6438N32 / 642 GHz60 MB205 W6.4DDR5-4800
Intel Xeon Gold 6438M32 / 642.2 GHz60 MB205 W6.4DDR5-4800
Intel Xeon Gold 6428N32 / 641.8 GHz60 MB185 W5.8DDR5-4800
Intel Xeon Gold 6421N32 / 641.8 GHz60 MB185 W5.8DDR5-4800
Intel Xeon Platinum 8562Y+32 / 642.8 GHz60 MB300 W9.4DDR5-5600
Intel Xeon Gold 6548N32 / 642.8 GHz60 MB250 W7.8DDR5-5200
Intel Xeon Gold 6548Y+32 / 642.5 GHz60 MB250 W7.8DDR5-5200
Intel Xeon Gold 5420+28 / 562 GHz53 MB205 W7.3DDR5-4400
Intel Xeon Gold 5512U28 / 562.1 GHz52.5 MB185 W6.6DDR5-4800
Intel Xeon Gold 6442Y24 / 482.6 GHz60 MB225 W9.4DDR5-4800
Intel Xeon Gold 5418Y24 / 482 GHz45 MB185 W7.7DDR5-4400
Intel Xeon Gold 5412U24 / 482.1 GHz45 MB185 W7.7DDR5-4400
Intel Xeon Gold 5418N24 / 481.8 GHz45 MB165 W6.9DDR5-4400
Intel Xeon Gold 5411N24 / 481.9 GHz45 MB165 W6.9DDR5-4400
Intel Xeon Gold 6542Y24 / 482.9 GHz60 MB250 W10.4DDR5-5200
Intel Xeon Silver 4416+20 / 402 GHz38 MB165 W8.3DDR5-4000
Intel Xeon Gold 6444Y16 / 323.5 GHz45 MB270 W16.9DDR5-4800
Intel Xeon Gold 6426Y16 / 322.6 GHz38 MB185 W11.6DDR5-4800
Intel Xeon Gold 5416S16 / 322 GHz30 MB150 W9.4DDR5-4400
Intel Xeon Gold 6526Y16 / 322.8 GHz37.5 MB195 W12.2DDR5-5200
Intel Xeon Silver 4514Y16 / 322 GHz30 MB150 W9.4DDR5-4400
Intel Xeon Silver 4410Y12 / 242 GHz30 MB150 W12.5DDR5-4000
Intel Xeon Silver 451012 / 242.4 GHz30 MB150 W12.5DDR5-4400
Intel Xeon Gold 64348 / 163.7 GHz23 MB205 W25.6DDR5-4800
Intel Xeon Gold 5415+8 / 162.9 GHz23 MB150 W18.8DDR5-4400
Intel Xeon Bronze 3408U8 / 161.8 GHz23 MB125 W15.6DDR5-4000
Intel Xeon Gold 65348 / 163.9 GHz22.5 MB195 W24.4DDR5-4800
Intel Xeon Silver 4509Y8 / 162.6 GHz23 MB125 W15.6DDR5-4400
  • Every processor of 250 W or more is marked for the MAX system board; everything below 250 W is marked for the Mainstream (MS) board.
  • Processors above 185 W take the L-type heat sink; 185 W and below use the standard heat sink.
  • Four 350 W SKUs — 9480, 9470, 8470Q and 6458Q — have no air-cooled option; Dell supports them with Direct Liquid Cooling only.
  • Dell prints N/A in the UPI column for the 8558U and 5512U, and marks turbo only as yes or no, so no turbo clocks are shown.
03 — Memory

32 DIMM slots, 16 per processor

Thirty-two DDR5 ECC RDIMM slots flank the two sockets, 16 per processor. Every configuration drops to 4400 MT/s at two DIMMs per channel, so capacity beyond one DIMM per channel costs bandwidth.

Capacity with every slot filled

by DIMM size
16 GB512 GB32 GB1 TB64 GB2 TB96 GB3 TB128 GB4 TB256 GB8 TB4800 MT/s part · 30°C in some layouts32 slots · 16 per processor · each tick = one DIMM

Operating speed

per Dell memory tables
Processor1 DIMM / channel2 DIMMs / channel
4th Gen Xeon Scalable / Xeon Max4800 MT/s4400 MT/s
5th Gen Xeon Scalable6400 / 5600 MT/s*4400 MT/s
  • * These are the rated speeds of the DIMMs Dell lists for 5th Gen. Dell’s processor table has only four of the fourteen 5th Gen SKUs running memory at 5600 MT/s (the rest 4400–5200 MT/s), and the R670 guide gives the R660 as up to 5600 MT/s.
  • 8 TB means 32 × 256 GB. Dell lists the 256 GB module only as an eight-rank 4800 MT/s RDIMM; its 6400/5600 MT/s DIMMs stop at 128 GB, which is 4 TB across 32 slots.
  • In the ten-bay 2.5-inch layouts, 256 GB RDIMMs lower the inlet ceiling to 30°C once processors exceed 250 W (225 W with rear drives).
  • RDIMMs of 128 GB and above are not supported in ASHRAE A3 or A4 conditions, and quad-rank 128 GB modules have reached end of life.
  • Unused DIMM slots need blanks when a processor uses the standard heat sink or is rated 250 W or higher.
04 — Storage

13 drive-bay layouts, up to 16 bays

Fourteen internal layouts, from a diskless chassis to sixteen EDSFF E3.S bays. There is no 3.5-inch option, and the front layout you choose also sets the thermal limits for processors, 256 GB memory and three-L4 GPU builds — the 8-bay front is the only drive layout that keeps 350 W parts on air.

Headline layouts

front panel view

Front panel

Rear module

The 2.5-inch maximum: ten front and two rear bays, built either all SAS4/SATA or all NVMe. Rear bays need the R3P or R2S+R3S riser layout.

SAS/SATANVMeSAS/SATA + NVMe

Controllers & boot

  • S160 — Software RAID. Entry tier (OS RAID)
  • PERC H355 — RAID. Value tier, PERC 11 (replaces H345 from Dec 2021)
  • HBA355i — HBA. Value tier, HBA 11 internal
  • HBA355e — HBA. Value tier, HBA 11 external
  • HBA465i — HBA. Value tier, HBA 12 internal (printed as HB465i in Table 8)
  • HBA465e — HBA. Value tier, HBA 12 external; available post-RTS
  • PERC H755 — RAID. Value Performance tier, PERC 11 (front PERC)
  • PERC H755N — RAID. Value Performance tier, PERC 11 NVMe
  • BOSS-N1 — boot
All 10 controllers and 1 boot options
  • PERC H965i — RAID, 8GB cache. Premium Performance tier, PERC 12 (Avenger), 8 GB DDR4 3200 MT/s cache, front PERC/adapter
  • PERC H965e — RAID, 8GB cache. Premium Performance tier, PERC 12 external, 8 GB DDR4 cache
  • E3.S drives, like the HBA465e, are listed as supported after the initial release (post-RTS).
  • Universal layouts give SAS/SATA drives hardware RAID; NVMe drives in those slots are direct-attached with no hardware RAID.
  • The front PERC mounts on the storage module rather than in a PCIe slot; the H965i carries 8 GB of DDR4 cache.
  • BOSS-N1 mirrors two M.2 NVMe drives (480 GB or 960 GB) in hardware RAID 1 for the operating system. It, rear drives and 2.5-inch NVMe are not supported in ASHRAE A4 conditions.

Every documented layout

13 with drive bays
10 x 2.5-inch (NVMe) + 2 x 2.5-inch (NVMe Direct)10 x 2.5-inch (NVMe) + 2 x 2.5-inch (NVMe Direct)1210 x 2.5-inch (SAS/SATA) + 2 x 2.5-inch (SAS/SATA)10 x 2.5-inch (SAS4/SATA) + 2 x 2.5-inch (SAS4/SATA)1210 x 2.5-inch (NVMe Direct)10 x 2.5-inch (NVMe Direct)1010 x 2.5-inch (SAS/SATA)10 x 2.5-inch (SAS4/SATA)1010 x 2.5-inch (SAS/SATA) with 2 x Universal slots10 x 2.5-inch (SAS4/SATA) with 2 x Universal slots1010 x 2.5-inch (SAS/SATA) with 4 x Universal slots …10 x 2.5-inch (SAS4/SATA) with 4 x Universal slots (SAS/SATA HWRAID + NVMe Direct)108 x 2.5-inch (NVMe Direct)8 x 2.5-inch (NVMe Direct)88 x 2.5-inch (NVMe RAID)8 x 2.5-inch (NVMe RAID)88 x 2.5-inch (SAS/SATA)8 x 2.5-inch (SAS4/SATA)88 x 2.5-inch Universal (SAS/SATA HWRAID + NVMe Dir…8 x 2.5-inch Universal (SAS/SATA HWRAID + NVMe Direct)814 x EDSFF E3.S + 2 x EDSFF E3.S (Gen5 x4 NVMe Dir…14 x EDSFF E3.S + 2 x EDSFF E3.S (Gen5 x4 NVMe Direct)1616 x EDSFF E3.S (NVMe RAID) - Dual RAID16 x EDSFF E3.S (NVMe RAID) - Dual RAID1614 x EDSFF E3.S (Gen5 x4 NVMe Direct)14 x EDSFF E3.S (Gen5 x4 NVMe Direct)14Bays · solid = front · dashed = rear · brighter = NVMe-only
2.5-inch3.5-inchEDSFF (E1.S / E3.S)
05 — Accelerators & I/O

GPUs, PCIe and networking

Single-wide cards only. Dell names two GPUs for the R660, the NVIDIA A2 and L4, rates the chassis for up to three 75 W cards, and offers no double-wide option; the 2U R760, by comparison, takes two double-wide cards at 350 W. Up to three single-wide 75 W cards; with three L4s, processor TDP is capped at 270 W, 225 W or 205 W depending on the drive layout.

NVIDIA A2

single-wide
up to 3

NVIDIA L4

single-wide
up to 3

I/O topology

80 lanes per CPU
CPU 180 × PCIe 5.016 DIMMCPU 280 × PCIe 5.016 DIMMUPI · up to 4 links · 16 / 20 GT/sUp to 2 × PCIe Gen5riser dependentor 3 × PCIe Gen4x16 low profile, risers 2 and 3OCP NIC 3.0 (Gen4)x8; x16 via cable on MAX boardOptional 2 × 1GbE LOMBCM5720 · plus iDRAC port

Each processor supplies 80 lanes of PCIe 5.0, but the R660 exposes at most three slots at the rear. Dell documents eleven riser configurations, including running with no riser at all.

Network adapters Dell lists

26 options
AdapterPortsForm
Broadcom 2 x 100 GbE QSFP56 OCP 3.02 × 100GbEOCP 3.0
Mellanox 2 x 100 GbE QSFP56 OCP 3.02 × 100GbEOCP 3.0
Intel 4 x 25 GbE SFP28 OCP 3.04 × 25GbEOCP 3.0
Broadcom 4 x 25 GbE SFP28 OCP 3.04 × 25GbEOCP 3.0
Intel 2 x 25 GbE SFP28 OCP 3.02 × 25GbEOCP 3.0
Broadcom 2 x 25 GbE SFP28 OCP 3.02 × 25GbEOCP 3.0
Mellanox 2 x 25 GbE SFP28 OCP 3.02 × 25GbEOCP 3.0
Broadcom 4 x 10 GbE BT OCP 3.04 × 10GbEOCP 3.0
Intel 2 x 10 GbE BT OCP 3.02 × 10GbEOCP 3.0
Intel 4 x 10 GbE BT OCP 3.04 × 10GbEOCP 3.0
Broadcom 2 x 10 GbE BT OCP 3.02 × 10GbEOCP 3.0
Broadcom 4 x 1 GbE BT OCP 3.04 × 1GbEOCP 3.0
Intel 4 x 1 GbE BT OCP 3.04 × 1GbEOCP 3.0
Broadcom 5720 (BCM5720) 2 x 1 GbE LOM (optional)2 × 1GbELOM
Intel Ethernet 100G 2P E810-C Adapter (FH and LP)2 × 100GbEPCIe
Broadcom NetXtreme-E P2100D BCM57508 2 x 100G QSFP PCIe (LP)2 × 100GbEPCIe
Mellanox ConnectX-6 Dx Dual Port 100 GbE QSFP56 PCIe Adapter (FH and LP)2 × 100GbEPCIe
Mellanox BlueField 2 DP 25 GbE SFP Crypto DPU (FH)2 × 25GbEPCIe
Broadcom NetXtreme-E P425D BCM57504 4 x 25G SFP28 PCIe (FH)4 × 25GbEPCIe
Intel Ethernet 25G 2P E810-XXV Adapter (LP)2 × 25GbEPCIe
NVIDIA ConnectX-6 LX Dual Port 25 GbE SFP28 Network Adapter (LP)2 × 25GbEPCIe
Broadcom BCM57414 25G SFP Dual Port PCIe adapter (LP)2 × 25GbEPCIe
Intel Ethernet i350 Quad Port 1 GbE BASE-T Adapter V2 (FH)4 × 1GbEPCIe
Intel E810-XXVDA4 Quad Port 10/25GbE SFP28 Adapter (FH)4 × 25GbEPCIe
Intel Ethernet 25G 4P E810-XXV OCP4 × 25GbEOCP 3.0
Broadcom BCM57414 25G SFP Dual Port OCP3 Mezz2 × 25GbEOCP 3.0
  • Processor-to-processor traffic uses up to four UPI links per socket: 16 GT/s on 4th Gen parts, 20 GT/s on most 5th Gen parts.
  • The OCP slot is wired x8 on the system board, so an x16 card falls back to x8 unless an OCP cable is fitted — possible only on the MAX board, and restricted where the storage configuration already uses the connectors involved.
  • Riser configurations R2R+R3R and R2A are single-processor layouts, and rear drive bays are possible only with R3P or R2S+R3S; Dell’s rear view of the 2 × 2.5-inch option shows a single low-profile slot left.
  • LOM plus OCP is a permitted pairing, but the LOM excludes the optional Management Interface Card used with a Dell DPU.
06 — Power & cooling

8 power supplies, 700–1,800 W

Up to two hot-plug supplies in Dell’s 60 mm form factor, running 1+1 redundant. The eight options cover standard and high-line-only AC, 277 VAC and 336 V HVDC, and −48 to −60 V DC (the 1100 W DC unit is on Dell’s NEBS parts list).

0500100015002000700 W Titanium — Mixed mode HLAC (200-240 V AC / 240 V DC); no 100-120 V low-line support; 60 mm700Titanium800 W N/A (-48 V DC) — -(48-60) V DC input (LVDC); 60 mm800DC800 W Platinum — Mixed mode (100-240 V AC / 240 V DC); 60 mm800Platinum1100 W N/A (-48 V DC) — -(48-60) V DC input (LVDC); 60 mm1100DC1100 W Titanium — Mixed mode (100-240 V AC / 240 V DC); 1050 W at low line 100-120 V; 60 mm10501100Titanium1400 W Platinum — Mixed mode (100-240 V AC / 240 V DC); 1050 W at low line 100-120 V; 60 mm10501400Platinum1400 W Titanium — Mixed mode 277 V AC and HVDC (336 V DC); 60 mm1400Titanium1800 W Titanium — Mixed mode HLAC (200-240 V AC / 240 V DC); no 100-120 V low-line support; 60 mm1800TitaniumWatts · dashed line = output at 100–120 V low line
AC277 VAC / HVDC−48 V DC
  • At 100–120 V the 1100 W Titanium and 1400 W Platinum supplies deliver 1050 W; the 700 W and 1800 W units have no low-line rating and need 200–240 V AC or 240 V DC.
  • The 1800 W supply takes a C15 lead (or C13 with a C14-to-C15 jumper), and the 277 VAC / HVDC unit an APP 2006G1 cord; the other AC supplies use C13.
  • Fit matching supplies: with two different wattages at POST, only the larger is enabled and a mismatch warning appears, and a supply added at run-time must match the first or it stays disabled.
  • ASHRAE A3 and A4 operation needs both supplies installed.
07 — Management, security & OS

Run it, secure it, choose the OS

Management

  • iDRAC9 with Lifecycle Controller (Express as standard on 600-series; Enterprise and Datacenter upgrades)
  • iDRAC Direct (front micro-USB)
  • iDRAC RESTful API with Redfish
  • iDRAC Service Module
  • Quick Sync 2 wireless module
  • OpenManage Enterprise with Power Manager, Service and Update Manager plugins
  • CloudIQ for PowerEdge
  • OpenManage integrations for VMware vCenter, Microsoft System Center and Windows Admin Center

Security

  • Silicon Root of Trust
  • Cryptographically signed firmware
  • Secure Boot
  • Secured Component Verification (hardware integrity check)
  • Data at Rest Encryption (SEDs, local or external key management)
  • System Lockdown (iDRAC9 Enterprise or Datacenter)
  • Secure Erase
  • TPM 2.0 FIPS, CC-TCG certified; TPM 2.0 China NationZ

Operating systems

  • Canonical Ubuntu Server LTS
  • Microsoft Windows Server with Hyper-V
  • Red Hat Enterprise Linux
  • SUSE Linux Enterprise Server
  • VMware ESXi
08 — Compare

R650 → R660 → R670

The R660 between the previous-generation R650 and the Xeon 6 R670 that Dell compares it with. Every cell comes from Dell’s R660 and R670 technical guides, mostly their comparison tables.

Previous generationPowerEdge R650
16GPowerEdge R660
17GPowerEdge R670
Processors
2 × 3rd Gen Intel Xeon
2 × 4th Gen Xeon Scalable or Xeon Max (to 56 cores) · 2 × 5th Gen (to 64 cores)
2 × Intel Xeon 6 — up to 86 P-cores or 144 E-cores
Memory
32 × DDR4 · RDIMM 2 TB or LRDIMM 8 TB · up to 3200 MT/s · 16 × PMem 200
32 × DDR5 RDIMM · 8 TB · up to 5600 MT/s
32 × DDR5 RDIMM · up to 6400 MT/s
Front bays
Up to 4 × 3.5" or 10 × 2.5" SAS/SATA/NVMe
8 or 10 × 2.5" SAS/SATA/NVMe · 14 or 16 × E3.S Gen5
Up to 20 × E3.S NVMe · 8 or 10 × 2.5"
Rear bays
2 × 2.5" SAS4/SATA
2 × 2.5" SAS4/SATA or 2 × E3.S
2 × E3.S NVMe
PCIe
3 × Gen4
2 × Gen5 or 3 × Gen4
3 × x16 Gen5
Accelerators
Up to 3 × 75 W single-wide
Up to 3 × 75 W single-wide
Up to 3 × 75 W single-width
Networking
Optional 2 × 1GbE LOM · 1 × OCP 3.0
Optional 2 × 1GbE LOM · 1 × OCP 3.0
2 × OCP NIC 3.0, front or rear
Power
800–1400 W AC · 1100 W −48 V DC
700–1800 W AC · 800 / 1100 W −48 V DC · 1400 W 277 VAC / HVDC
800–1500 W · 1400 W −48 V DC · 1800 W HLAC and 1500 W 277 V / HVDC not at launch
Depth (with bezel)
772.11 mm
822.88 mm
816.92 mm (rear-I/O build)
Weight
—
22.51 kg
20.42 kg
Management
iDRAC9
iDRAC9
iDRAC10

Source: Dell PowerEdge R660 Technical Guide, Table 2 (R660 vs R650); Dell PowerEdge R670 Technical Guide (Rev. A07), Table 2 (R670 vs R660) and its iDRAC chapter.

The R660 family side by side

Around the R660 sit the pared-back R660xs, two AMD EPYC 1U machines (the two-socket R6625 and single-socket R6615), the 2U R760 on the same Xeon processors, and the Xeon 6 R670. The bars compare the limits documented for each.

R660R660xsR6625R6615R760R670Cores / CPUR660: 6464R660xs: 3232R6625: 128128R6615: 128128R760: 6464R670: 144144DIMM slotsR660: 3232R660xs: 1616R6625: 2424R6615: 1212R760: 3232R670: 3232Max memoryR660: 8 TB8R660xs: 1.5 TB1.5R6625: 6 TB6R6615: 3 TB3R760: 8 TB8R670: 8 TB8Max drive baysR660: 1616R660xs: 1212R6625: 1616R6615: 1616R760: 2828R670: 2222Max GPUsR660: 33R660xs: 00R6625: 22R6615: 22R760: 66R670: 33Largest PSUR660: 1,800 W1,800R660xs: 1,800 W1,800R6625: 1,800 W1,800R6615: 1,800 W1,800R760: 3,200 W3,200R670: 1,800 W1,800
This modelSiblings and successorEach value from that model’s own verified spec file · bars scale per column
R760 data sheetR660 vs HPE DL360 Gen11 vs Lenovo SR630 V3R660 vs HPE DL360 Gen12Lenovo SR630 V3 data sheetLenovo SR645 V3 data sheet
09 — Use cases

Five builds that suit the R660

Five 1U builds that stay inside the thermal rules Dell documents for the R660. Each uses only parts the configurator allows on this model and opens pre-filled, ready to change.

Virtualisation

Ten-bay NVMe hypervisor host

The R660’s core job: two 32-core 5th Gen processors, a terabyte of DDR5 and ten direct-attached NVMe drives for software-defined storage or a local datastore, with the boot mirror on BOSS-N1 instead of a front bay. At 250 W these processors are rated for 35°C inlet on air in the ten-bay chassis.

  • 2 × Xeon Gold 6548Y+ — 32 cores @ 2.5 GHz, 250 W each
  • 16 × 64 GB DDR5-6400 RDIMM — 1 TB (runs at up to 5200 MT/s with this processor)
  • 10 × 3.84 TB NVMe Gen4 U.2 — 38.4 TB raw
  • BOSS-N1 boot mirror (2 × 480 GB M.2 NVMe, RAID 1)
  • Broadcom 4 × 25GbE SFP28 OCP 3.0
  • 2 × 1400 W Platinum (1+1)
Open this build in the configurator →
Databases

Per-core-licensed database server

Sixteen cores per socket at a 3.5 GHz base keep the licensable core count modest, and eight SAS SSDs sit behind the H965i front PERC and its 8 GB cache. At 270 W the 6444Y calls for High-performance Gold fans, which the 8 × 2.5-inch chassis supports at up to 35°C.

  • 2 × Xeon Gold 6444Y — 16 cores @ 3.5 GHz, 270 W each
  • 16 × 64 GB DDR5-4800 RDIMM — 1 TB
  • 8 × 3.84 TB SAS SSD, read intensive — 30.72 TB raw
  • PERC H965i front controller, 8 GB DDR4 cache
  • BOSS-N1 boot mirror (2 × 480 GB M.2 NVMe, RAID 1)
  • Broadcom BCM57412 2 × 25GbE SFP28 OCP 3.0
  • 2 × 1100 W Titanium (1+1)
Open this build in the configurator →
AI inference

Three-L4 inference node

Three single-wide NVIDIA L4 cards fill all three low-profile slots, so the network uplink moves to the OCP bay. The 8 × 2.5-inch front keeps the highest processor ceiling Dell allows with three L4s, 270 W, which the 250 W 6542Y sits under.

  • 2 × Xeon Gold 6542Y — 24 cores @ 2.9 GHz, 250 W each
  • 3 × NVIDIA L4 (single-wide, 75 W class)
  • 16 × 32 GB DDR5-6400 RDIMM — 512 GB
  • 4 × 7.68 TB NVMe Gen4 U.2 — 30.72 TB raw
  • BOSS-N1 boot mirror (2 × 480 GB M.2 NVMe, RAID 1)
  • Intel 2 × 25GbE SFP28 OCP 3.0
  • 2 × 1400 W Platinum (1+1)

With three L4s Dell caps processor TDP at 270 W in this layout, 225 W with ten 2.5-inch or 16 E3.S bays, and as low as 205 W once rear drives are added. GPUs are not supported in ASHRAE A3 or A4 environments.

Open this build in the configurator →
Telco

NEBS-validated −48 V DC server

Dell validates the R660 to NEBS Level 3 and ETSI, for −5°C to 40°C continuous operation with 96-hour excursions to 55°C. This build uses parts on that list — the 185 W 6428N, the PERC H755 and SATA SSDs — and runs from the 1100 W −48 to −60 V DC supplies.

  • 2 × Xeon Gold 6428N — 32 cores @ 1.8 GHz, 185 W each
  • 16 × 32 GB DDR5-4800 RDIMM — 512 GB
  • 4 × 1.92 TB SATA SSD on the ten-bay SAS/SATA backplane
  • PERC H755 hardware RAID
  • Intel 4 × 25GbE SFP28 OCP 3.0
  • 2 × 1100 W −48 to −60 V DC (1+1)

NEBS Level 3 covers a defined configuration: processors up to 185 W, the listed controllers and cards, HPR Gold fans and a filtered bezel. Two-post telco racks need Dell’s A14 static rails. Check each part against Dell’s NEBS list before ordering.

Open this build in the configurator →
Compute density

128 cores in one rack unit

Two 64-core 8592+ processors put 128 cores in a single U. Dell’s 5th Gen thermal table allows 350 W parts on air only with the no-backplane or 8 × 2.5-inch front and inlet air at 30°C or below, so this build uses the eight-bay front with four NVMe drives and a 100GbE adapter for cluster traffic.

  • 2 × Xeon Platinum 8592+ — 64 cores @ 1.9 GHz, 350 W each
  • 16 × 64 GB DDR5-6400 RDIMM — 1 TB (runs at up to 5600 MT/s with this processor)
  • 4 × 3.84 TB NVMe Gen4 U.2 — 15.36 TB raw
  • BOSS-N1 boot mirror (2 × 480 GB M.2 NVMe, RAID 1)
  • NVIDIA ConnectX-6 Dx 2 × 100GbE QSFP56 PCIe adapter
  • 2 × 1800 W Titanium (200–240 V only)

Above 30°C inlet, or with the ten-bay or E3.S fronts, 350 W 5th Gen parts are not listed for air cooling. Empty DIMM slots need blanks at 250 W and above, and the 1800 W supply needs a C15 lead, or a C13 lead with a C14-to-C15 jumper.

Open this build in the configurator →
10 — Refurbished alternatives

When a refurbished PowerEdge makes more sense

If PCIe Gen5, DDR5 and E3.S are not on the requirements list, an earlier refurbished 1U PowerEdge covers many of the same roles on a smaller budget.

14G · re-certified

PowerEdge R640

  • 1U · 2 × Xeon Scalable
  • 24 DIMM slots · up to 3 TB DDR4
  • Up to 10 × 2.5" bays, NVMe-capable
  • iDRAC9

The closest refurbished 1U match for virtualisation and VDI hosts when three terabytes of DDR4 and ten bays are enough.

Configure a refurbished R640 →
14G · re-certified

PowerEdge R440

  • 1U · 2 × Xeon Scalable
  • 16 DIMM slots · up to 1 TB DDR4
  • 10 × 2.5" or 4 × 3.5" bays
  • iDRAC9

Branch, web and infrastructure servers that need two sockets in 1U but not the R660’s memory or NVMe density.

Configure a refurbished R440 →
13G · re-certified

PowerEdge R630

  • 1U · 2 × Xeon E5-2600 v3/v4
  • 24 DIMM slots · up to 1.5 TB DDR4
  • 10 × 2.5" or 4 × 3.5" bays
  • iDRAC8

Lab, test and standby capacity where an older platform managed through iDRAC8 is acceptable.

Configure a refurbished R630 →
Refurbished Dell PowerEdge serversRefurbished PowerEdge configuratorNew vs refurbished cost calculator
11 — Full specifications

Dell PowerEdge R660 specifications

Chassis & cooling

Form factor1U rack server
Dimensions (H × W × D)42.8 × 482 × 822.88 mm with bezel · 809.04 mm deep without
WeightUp to 22.51 kg with drives fully populated · 18.5 kg without drives and PSUs
CoolingAir, or optional Direct Liquid Cooling (needs rack manifolds and a CDU)
FansUp to four hot-plug dual-fan modules — Standard or High-performance Gold · N+1 fan redundancy
BezelOptional LCD bezel or security bezel
RailsA15 ReadyRails II or A16 Stab-in/Drop-in sliding rails · A14 static rails (required for 2-post racks) · optional CMA (not with DLC) or strain relief bar

Processor

SocketsOne or two
Families4th Gen Intel Xeon Scalable, Intel Xeon Max, 5th Gen Intel Xeon Scalable
Cores per processorUp to 56 (4th Gen / Xeon Max) · up to 64 (5th Gen)
Maximum TDP350 W
UPIUp to 4 links per processor · up to 16 GT/s (4th Gen) or 20 GT/s (5th Gen)
PCIe lanes80 × PCIe 5.0 per processor
AccelerationOptional Intel QuickAssist Technology (4th Gen)

Memory

Slots32 DDR5 ECC RDIMM · 16 per processor
DIMM sizes16, 32, 64, 96, 128 and 256 GB
Speed4th Gen: 4800 MT/s (1 DPC) / 4400 MT/s (2 DPC) · 5th Gen: 6400/5600 MT/s-rated DIMMs (1 DPC) / 4400 MT/s (2 DPC)
Maximum8 TB (32 × 256 GB RDIMM)
Voltage1.1 V

Storage

FrontNo backplane · 8 or 10 × 2.5" SAS/SATA/NVMe · 14 or 16 × EDSFF E3.S Gen5 NVMe
Rear2 × 2.5" SAS4/SATA (NVMe with the 10-bay NVMe front) or 2 × EDSFF E3.S Gen5 NVMe
ControllersPERC H965i, H965e, H755, H755N, H355 · HBA355i, HBA355e, HBA465i, HBA465e · S160 software RAID
BootBOSS-N1: hardware RAID 1, 2 × M.2 NVMe (480 or 960 GB) · internal USB
ExternalUSB tape, NAS software stack, 12Gb MD-series JBODs

Expansion & networking

PCIe slotsUp to three: 2 × Gen5 or 3 × Gen4 · 11 riser configurations including no riser
OCP1 × OCP NIC 3.0 (SFF, Gen4): 4 × 1GbE, 2 or 4 × 10GbE, 2 or 4 × 25GbE, 2 × 100GbE
LOMOptional 2 × 1GbE (Broadcom BCM5720)
DPUOptional Management Interface Card for a Dell DPU (not together with the LOM)

Accelerators

GPU envelopeUp to 3 × single-wide 75 W — NVIDIA A2 or NVIDIA L4
RestrictionsNot supported in ASHRAE A3/A4 · processor TDP caps with three L4s

Power

SuppliesUp to two hot-plug, 1+1 redundant, 60 mm form factor
AC options700 W Titanium (200–240 V) · 800 W Platinum · 1100 W Titanium · 1400 W Platinum · 1800 W Titanium (200–240 V)
277 VAC / HVDC1400 W Titanium, 277 VAC or 336 V DC
DC input800 W and 1100 W, −48 to −60 V DC

Ports & video

Front1 × USB 2.0 · 1 × VGA · 1 × iDRAC Direct (micro-USB)
Rear1 × USB 2.0 · 1 × USB 3.1 · 1 × VGA (optional with DLC) · 1 × dedicated iDRAC Ethernet · optional serial
Internal1 × USB 3.0 (optional)
VideoIntegrated Matrox G200, 16 MB

Environment

ASHRAE A210–35°C below 900 m, de-rated 1°C per 300 m above
ASHRAE A3 / A45–40°C with configuration restrictions
NEBS Level 3 / ETSI−5 to 40°C continuous · 96-hour excursions to 55°C (validated configuration)
12 — FAQ

R660 questions, answered from the documentation

What is the maximum memory of the Dell PowerEdge R660?

The R660 has 32 DDR5 RDIMM slots, 16 per processor, and reaches 8 TB with 32 × 256 GB modules. Dell lists the 256 GB module only as a 4800 MT/s part; the 6400/5600 MT/s modules it lists for 5th Gen Xeon go up to 128 GB, or 4 TB across all 32 slots.

Which processors does the R660 support?

Fifty-one in total. Thirty-seven come from Dell’s 4th Gen table (including four Xeon Max parts) and fourteen are 5th Gen Xeon Scalable. Core counts run from 8 to 64 and TDP from 125 W up to 350 W. Anything rated 250 W or higher sits on the MAX system board, and four SKUs — 9480, 9470, 8470Q and 6458Q — are liquid-cooled only.

Can the R660 run 350 W processors with air cooling?

Only with two front configurations. Dell’s thermal tables allow air-cooled 350 W processors with no drive backplane or with the 8 × 2.5-inch front, and then only at an inlet temperature of 30°C or less. Dell’s main air-cooling matrix marks the ten-bay and E3.S layouts as needing Direct Liquid Cooling at 350 W, and its separate 5th Gen table lists no 350 W air support in them.

How many drive bays does the R660 have?

Up to 16: either 16 EDSFF E3.S Gen5 NVMe bays at the front, or 14 at the front plus two at the rear. With 2.5-inch drives the maximum is ten at the front and two at the rear. There is no 3.5-inch option.

How many GPUs does the R660 support?

Up to three single-wide 75 W cards, and Dell names the NVIDIA A2 and L4. With three L4s, processor TDP is limited to 270 W with no backplane or the 8 × 2.5-inch front, and to 225 W or 205 W in the larger layouts. There is no double-wide GPU option in this chassis.

How many PCIe slots does the R660 have?

Up to three: two at PCIe Gen5 or three at Gen4, depending on the riser configuration. Each processor provides 80 lanes of PCIe 5.0, and there is one OCP NIC 3.0 slot (Gen4, x8, or x16 with a cable on the MAX system board) plus an optional 2 × 1GbE LOM.

How big and heavy is the PowerEdge R660?

It is 42.8 mm high, 482 mm wide and 822.88 mm deep with the bezel, or 809.04 mm without it. A system with every drive bay filled weighs up to 22.51 kg; without drives and power supplies it is 18.5 kg.

How does the R660 differ from the R760 and R660xs?

The 2U R760 takes the same 51 processors and 32 DDR5 slots but offers up to 28 drive bays and 12 × 3.5-inch layouts, up to eight PCIe slots, double-wide GPUs and supplies up to 3200 W. The R660xs is the pared-back 1U sibling, with 16 DIMM slots and 1.5 TB, processors of up to 32 cores (4th Gen) or 28 (5th Gen), and a 4 × 3.5-inch layout the R660 does not offer. The R660 keeps full core counts and memory capacity in 1U.

What changed from the R660 to the R670?

The R670 is Dell’s 1U Xeon 6 server, and its technical guide compares it directly with the R660. Per socket it offers 86 P-cores or 144 E-cores, memory reaches 6400 MT/s (the R660 tops out at 5600), and the front takes as many as 20 E3.S drives. It also brings three x16 Gen5 slots, two OCP NIC 3.0 slots and iDRAC10, while GPU support is unchanged at three 75 W single-width cards.

Is the Dell PowerEdge R660 end of life?

Dell’s R660 technical guide does not give a model-wide end-of-sale or end-of-service date. Its service appendix describes Post Standard Support, which extends hardware cover by up to five years beyond an initial seven years of ProSupport. Our end-of-life checker tracks dates as Dell publishes them.

Sources & verification

Where these figures come from

Specifications are extracted from Dell’s published documents and independently re-checked line by line. Configurations are quote-based; availability and exact options are confirmed at quotation. Last reviewed 2026-09-11.

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