The R660xs is the lighter-specified two-socket 1U PowerEdge of Dell’s 16G range: 16 DDR5 slots rather than 32, processors of up to 32 cores, air cooling only, and a four-bay 3.5-inch front the R660 does not offer. This page maps what Dell documents for it — processors, memory rules, drive layouts, risers, power and the thermal limits that decide which parts can be combined.
1U Rack1 or 2 sockets5th Gen Xeon Scalable4th Gen Xeon ScalableiDRAC9
32cores per CPU4th Gen · 28 on 5th Gen
1.5TBDDR5 maximum16 slots · 16 × 96 GB
12drive bays10 + 2 rear × 2.5" · or 4 × 3.5" + 2
3PCIe slots3 × Gen4 or 2 × Gen5, low profile
712.95mmdeep to PSU handle661.37 mm: 8 × SAS/SATA or diskless
Our read of Dell’s documentation: where the R660xs is strong, and the limits worth knowing before you spec one.
Strengths
+A short 1U: 712.95 mm from rack ears to PSU handles for the 10-bay, 4 × 3.5-inch and 8 × NVMe builds, 661.37 mm for the 8 × SAS/SATA or diskless chassis, and 748.79 mm with the bezel against 822.88 mm for the R660.
+Four 3.5-inch bays in one rack unit (up to 96 TB in Dell’s table) — a front the R660 does not list — alongside 8- and 10-bay 2.5-inch fronts in SAS, SATA or NVMe.
+Air cooling is the only cooling option on the spec sheet, so there are no liquid-cooling manifolds or CDUs to plan for.
+The 600 W and 800 W supplies deliver their full rating on 100–120 V circuits, and the list of nine units also covers −48 V DC and 277 VAC / HVDC feeds.
+Up to five I/O devices in 1U: three low-profile slots, the OCP 3.0 slot and a front PERC that takes no PCIe slot.
Watch-outs
!Memory tops out at 1.5 TB across 16 slots at one DIMM per channel, and 96 GB modules are allowed only in counts of 1, 6 or 8 per processor.
!Core counts top out at 32 on 4th Gen and 28 on 5th Gen; the hottest SKU in Dell’s table is 225 W, below the 250 W figure quoted for the platform.
!No GPUs — Dell’s R470 comparison says so outright — and no EDSFF E3.S bays.
!The OCP slot is wired x8 where the R650xs had x16, and Dell’s OCP feature table stops at 25 GbE (its slot-priority tables do also name 100 Gb OCP cards).
!In the 4 × 3.5-inch chassis the two 225 W processors (6448Y, 6442Y) need Dell’s hardware restriction: only two front drives, PCIe slot 1 and the OCP slot as the sole rear I/O (no BOSS, no slots 2–3), and a 30°C inlet ceiling if the rear drive pair is fitted.
Processors21 SKUs
Cores / CPU8–32
DIMM slots16
Drive layouts10
Max bays12
PSU options9 · to 1,800 W
02 — Processors
21 supported processors, mapped
Twenty-one Xeon SKUs appear in Dell’s R660xs processor table. Thirteen belong to the 4th Gen Scalable line and reach 32 cores; the other eight are 5th Gen parts topping out at 28. TDP spans 125 W to 225 W, so the R660’s higher-power bins are not offered. Each SKU is plotted below by core count and power.
Processor landscape — cores × TDP
21 SKUs · 2 families
5th Gen Xeon Scalable 84th Gen Xeon Scalable 13Bubble size = L3 cache · hover a bubble for the full SKU
Processor explorer
filter · sort · compare
Processor
Cores / threads
Base
L3 cache
TDP
W / core
Memory
Intel Xeon Gold 6448Y
32 / 64
2.2 GHz
60 MB
225 W
7.0
DDR5-4800
Intel Xeon Gold 6438Y+
32 / 64
2 GHz
60 MB
205 W
6.4
DDR5-4800
Intel Xeon Gold 6414U
32 / 64
2 GHz
60 MB
185 W
5.8
DDR5-4800
Intel Xeon Gold 5520+
28 / 56
2.2 GHz
52.5 MB
205 W
7.3
DDR5-4800
Intel Xeon Gold 5512U
28 / 56
2.1 GHz
52.5 MB
185 W
6.6
DDR5-4800
Intel Xeon Gold 5420+
28 / 56
2 GHz
53 MB
205 W
7.3
DDR5-4400
Intel Xeon Silver 4516Y+
24 / 48
2.2 GHz
45 MB
185 W
7.7
DDR5-4400
Intel Xeon Gold 6442Y
24 / 48
2.6 GHz
60 MB
225 W
9.4
DDR5-4800
Intel Xeon Gold 5418Y
24 / 48
2 GHz
45 MB
185 W
7.7
DDR5-4400
Intel Xeon Silver 4416+
20 / 40
2 GHz
38 MB
165 W
8.3
DDR5-4000
Intel Xeon Gold 6526Y
16 / 32
2.8 GHz
37.5 MB
195 W
12.2
DDR5-5200
Intel Xeon Silver 4514Y
16 / 32
2 GHz
30 MB
150 W
9.4
DDR5-4400
Intel Xeon Gold 6426Y
16 / 32
2.6 GHz
38 MB
185 W
11.6
DDR5-4800
Intel Xeon Gold 5416S
16 / 32
2 GHz
30 MB
150 W
9.4
DDR5-4400
Intel Xeon Silver 4510
12 / 24
2.4 GHz
30 MB
150 W
12.5
DDR5-4400
Intel Xeon Silver 4410Y
12 / 24
2 GHz
30 MB
150 W
12.5
DDR5-4000
Intel Xeon Silver 4410T
10 / 24
2.7 GHz
27 MB
150 W
15.0
DDR5-4000
Intel Xeon Gold 6534
8 / 16
3.9 GHz
22.5 MB
195 W
24.4
DDR5-4800
Intel Xeon Silver 4509Y
8 / 16
2.6 GHz
23 MB
125 W
15.6
DDR5-4400
Intel Xeon Gold 5415+
8 / 16
2.9 GHz
23 MB
150 W
18.8
DDR5-4400
Intel Xeon Bronze 3408U
8 / 16
1.8 GHz
23 MB
125 W
15.6
DDR5-4000
The UPI column reads N/A for the 5512U; every other SKU lists 16 or 20 GT/s.
Turbo is marked only as present or absent — the 3408U is the single no-turbo part — so no boost clocks appear.
Memory speed follows the processor: 5200 MT/s only on the 6526Y, 4800 MT/s on the 6534, 5512U, 5520+ and the 64xx 4th Gen parts, and 4000–4400 MT/s on the rest.
Heat sinks follow TDP: the standard sink up to 150 W, the high-performance (HPR) sink from 165 W upwards.
03 — Memory
16 DIMM slots, 8 per processor
Each processor drives eight DDR5 RDIMM slots at one DIMM per channel, 16 in all — half the R660’s count. With a single processor only slots A1–A8 are live, which caps that build at eight modules.
Capacity with every slot filled
by DIMM size
Rated memory speed
from the processor table
Processor family
Up to
5th Gen Xeon Scalable
5200 MT/s
4th Gen Xeon Scalable
4800 MT/s
The 1.5 TB maximum is 16 × 96 GB. Dell’s part list (Table 14) has the 96 GB module only as a 5600 MT/s part and the guide marks 5600 MT/s RDIMMs for 5th Gen Xeon, although its memory matrix (Table 15) groups 96 GB with both 4800 and 5600 MT/s ratings.
5600 MT/s modules run at up to 5200 MT/s here, the platform ceiling; 4800 MT/s modules run at up to 4800 MT/s.
Capacities cannot be mixed, and modules of different speeds all fall back to the slowest one fitted.
Two-processor systems take 2, 4, 8, 12 or 16 DIMMs, populated alternately between the sockets.
04 — Storage
10 drive-bay layouts, up to 12 bays
Three front families — 4 × 3.5-inch, 8 × 2.5-inch and 10 × 2.5-inch — plus a diskless chassis, with an optional two-bay 2.5-inch rear module that occupies the riser 2 position. The front also sets chassis depth, fan type and how hot a processor the chassis can cool.
Headline layouts
front panel view
Front panel
Rear module
The 12-bay maximum. The ten front bays are built either SAS4/SATA or NVMe; the rear module takes SAS, SATA or NVMe and replaces riser 2, leaving one low-profile slot.
SAS/SATANVMeSAS/SATA + NVMe
Controllers & boot
S160 — Software RAID. Entry tier; OS RAID / S160; Gen4 NVMe, RAID 0/1/5/10, max 8 drives, Windows only per Table 18
PERC H355 — RAID. Value tier, PERC 11 (front or adapter); no cache; RAID 0/1/10; up to 32 RAID or 32 non-RAID drives; replaces H345 from Dec 2021
HBA355i — HBA. Value tier, HBA 11 internal (front or adapter); 12 Gb SAS; 16 drives/controller, 50 with SAS expander
HBA355e — HBA. Value tier, HBA 11 external adapter; 4 x 4 external ports; 240 drives
HBA465i — HBA. Value tier, HBA 12.2 internal (front); 24 Gb SAS; PCIe Gen4; 16 drives/controller, 50 with SAS expander
HBA465e — HBA. Value tier, HBA 12 external (listed in Table 2 and Table 17; not in feature matrix Table 18)
PERC H755 — RAID, 8GB cache. Value Performance tier, PERC 11 (adapter or front SAS/SATA-only); 8 GB NV flash-backed cache; RAID 0/1/5/6/10/50/60; 16 drives, 50 with expander
PERC H755N — RAID, 8GB cache. Value Performance tier, PERC 11 NVMe-only front PERC; 8 GB NV cache; 8 drives/controller
PERC H965i — RAID, 8GB cache. Premium Performance tier, PERC 12 (Avenger), front PERC or adapter; 8 GB DDR4 NV cache; 24 Gb SAS + Gen3/Gen4 NVMe; RAID 0/1/5/6/10/50/60; 16 drives
PERC H965e — RAID. Premium Performance tier, PERC 12 external (Table 2 / Table 17); cache not printed for the external card; cannot be installed in PCIe slot 1
Maximum capacities in Dell’s comparison table: 96 TB for 4 × 3.5-inch, 122.88 TB for 8 × 2.5-inch, 153.6 TB for 10 × 2.5-inch and 15.2 TB for the rear pair.
The front (fPERC) versions of the H355, H755, H755N, H965i, HBA355i and HBA465i connect without using an expansion slot. S160 software RAID handles up to eight NVMe drives and is Windows-only.
BOSS-N1 on this chassis is internal and cold-swap: two 480 GB or 960 GB M.2 NVMe drives, mirrored (RAID 1) or striped (RAID 0). The 2U R760xs guide rates its BOSS-N1 as fully hot-plug.
Some drives allowed at the front are barred from the rear module, among them Kioxia PM6 SAS, Kioxia CM6 NVMe and Samsung PM1733/PM1735 above set capacities.
Rear drives are not supported under ASHRAE A3 or A4 conditions.
Every documented layout
10 with drive bays
2.5-inch3.5-inchEDSFF (E1.S / E3.S)
05 — I/O & networking
PCIe and networking
I/O topology
80 lanes per CPU
Each processor brings 80 PCIe 5.0 lanes, but the 1U chassis exposes at most three low-profile, half-length slots, across six riser configurations plus a riser-less build. The riser decides which slots run at Gen5.
Network adapters Dell lists
27 options
Adapter
Ports
Form
Broadcom 2 x 10 GbE BT OCP 3.0
2 × 10GbE
OCP 3.0
Broadcom 2 x 25 GbE SFP28 OCP 3.0
2 × 25GbE
OCP 3.0
Broadcom 4 x 25 GbE SFP28 OCP 3.0
4 × 25GbE
OCP 3.0
Broadcom 4 x 1 GbE BT OCP 3.0
4 × 1GbE
OCP 3.0
Broadcom 4 x 10 GbE BT OCP 3.0
4 × 10GbE
OCP 3.0
Intel 4 x 1 GbE BT OCP 3.0
4 × 1GbE
OCP 3.0
Intel 2 x 10 GbE BT OCP 3.0
2 × 10GbE
OCP 3.0
Intel 4 x 10 GbE BT OCP 3.0
4 × 10GbE
OCP 3.0
Intel 2 x 25 GbE SFP28 OCP 3.0
2 × 25GbE
OCP 3.0
Intel 4 x 25 GbE SFP28 OCP 3.0
4 × 25GbE
OCP 3.0
Intel (OCP: 100Gb) - slot priority matrix entry only
× 100GbE
OCP 3.0
Mellanox (OCP: 100Gb) - slot priority matrix entry only
× 100GbE
OCP 3.0
Broadcom BCM5720 2 x 1 GbE LOM (embedded)
2 × 1GbE
LOM
Mellanox NIC: NDR100 (InfiniBand/Ethernet)
× NDR100
PCIe
Mellanox NIC: NDR200 (InfiniBand/Ethernet)
× NDR200
PCIe
Mellanox NIC: HDR100 VPI
× HDR100
PCIe
Mellanox NIC: HDR VPI
× HDR
PCIe
Mellanox NIC: 100Gb
× 100GbE
PCIe
Broadcom NIC: 100Gb
× 100GbE
PCIe
Intel NIC: 100Gb
× 100GbE
PCIe
Mellanox NIC: 25Gb
× 25GbE
PCIe
Intel NIC: 25Gb
× 25GbE
PCIe
Broadcom NIC: 25Gb
× 25GbE
PCIe
Broadcom NIC: 10Gb
× 10GbE
PCIe
Intel NIC: 10Gb
× 10GbE
PCIe
Intel NIC: 1Gb
× 1GbE
PCIe
Broadcom NIC: 1Gb
× 1GbE
PCIe
With one processor, the spec sheet allows two slots: one x16 Gen4 and one x8 Gen5.
The rear drive module sits where riser 2 would, so a rear-drive build keeps only slot 1 (x16).
Dell lists NDR100 and NDR200 adapters only for slot 2 of the two R2e riser layouts, one card each, and no riser layout takes more than two 100 Gb PCIe NICs.
Expansion slots are not hot-swappable, and the H965e external PERC cannot be fitted in slot 1.
06 — Power & cooling
9 power supplies, 600–1,800 W
Two 60 mm hot-plug bays take a 1+1 pair from a list of nine: seven AC supplies between 600 W and 1800 W, an 1100 W DC unit (−48 to −60 V), and a 1400 W Titanium unit fed from 277 VAC or high-voltage DC (336 V in Dell’s PSU table and spec sheet, 366 V in the guide’s overview tables).
AC277 VAC / HVDC−48 V DC
Low-line (100–120 V) circuits: the 600 W and 800 W models keep full output, the 1100 W and 1400 W mixed-mode models give 1050 W, and a 200–240 V feed is mandatory for the 700 W and 1800 W models.
Mixed-mode units from 600 W to 1400 W take a C13 lead. The 1800 W unit has a C15 inlet, which a C13 cord can reach through a C14-to-C15 jumper; the DC model plugs in through a Lotes connector and the 277 V model through an APP 2006G1 cord.
If two different wattages are present at POST only the larger supply is enabled, with a mismatch warning; a second unit added while running must match or it stays disabled.
Dell’s quietest acoustic test build — one 125 W processor, two DIMMs and a single 600 W supply — measured 32 dB at idle and 34 dB operating at the bystander position; the ten-bay test build with eight NVMe drives reached 56 dB at full load in 35°C air.
ASHRAE A3 and A4 operation requires both supplies.
07 — Management, security & OS
Run it, secure it, choose the OS
Management
iDRAC9 with Express, Enterprise and Datacenter licence tiers
iDRAC Direct (front micro-USB)
iDRAC RESTful API with Redfish
iDRAC Service Module
Open Server Manager
Quick Sync 2 wireless module (optional)
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
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 vSAN / ESXi
08 — Compare
R650xs → R660xs → R470
The R660xs between the Xeon Scalable R650xs that preceded it and the single-socket Xeon 6 R470 that Dell now sets against it. Every cell comes from the comparison tables in the R660xs and R470 technical guides.
Six PowerEdge servers for scale: the R660 shares this model’s Xeon generations with twice the DIMM slots, the R760xs is the 2U build of the same 16-DIMM, 21-processor design, the R470 is the single-socket Xeon 6 machine Dell sets against it, and the R6615 and R360 complete the set. Bars show each one’s documented limits.
This modelSiblings and successorEach value from that model’s own verified spec file · bars scale per column
Four builds matched to what the R660xs does well: dense, air-cooled 1U compute with moderate memory. All four are assembled from parts our configurator permits for the R660xs, and none breaks the thermal rules above.
Virtualisation
Ten-bay NVMe hypervisor node
Two 32-core 6448Y processors put 64 cores in a rack unit, and ten Gen4 NVMe drives hold a local datastore or vSAN capacity while the hypervisor boots from BOSS-N1. At 225 W the ten-bay NVMe front runs these processors on HPR Gold fans with a 35°C inlet limit, as long as no rear drives are fitted.
2 × Xeon Gold 6448Y — 32 cores @ 2.2 GHz, 225 W each
16 × 64 GB DDR5-4800 RDIMM — 1 TB, one DIMM per channel
10 × 3.84 TB NVMe Gen4 U.2 — 38.4 TB raw
BOSS-N1 boot pair (2 × M.2 NVMe, RAID 1)
Broadcom 2 × 25GbE SFP28 OCP 3.0
1400 W Platinum hot-plug supplies (1+1)
VMware vSphere ESXi 8.0 · ProSupport 3 years
Adding the rear drive module lowers the inlet limit to 30°C with these 225 W processors. The 6448Y runs memory at up to 4800 MT/s.
Scale-out database is one of Dell’s named workloads for this server. The 16-core 6526Y is the only processor in its table that runs memory at 5200 MT/s, and 16 × 96 GB reaches the platform ceiling of 1.5 TB. Ten SAS SSDs hang off the front-mounted H965i, whose 8 GB flash-backed cache absorbs write bursts.
2 × Xeon Gold 6526Y — 16 cores @ 2.8 GHz, 195 W each
16 × 96 GB DDR5-5600 RDIMM — 1.5 TB (runs at up to 5200 MT/s)
10 × 3.84 TB SAS SSD — 38.4 TB raw
PERC H965i front controller, 8 GB NV cache
BOSS-N1 boot pair (2 × M.2 NVMe, RAID 1)
Intel 2 × 25GbE SFP28 OCP 3.0
1100 W Titanium hot-plug supplies (1+1)
Red Hat Enterprise Linux 9 · ProSupport Plus 3 years
96 GB RDIMMs are supported only 1, 6 or 8 to a processor. The 10-bay SAS4 front needs HPR Gold fans and, at 195 W, a 35°C inlet ceiling. With rear drives Dell’s fan matrix cuts that to 30°C, though the chassis notes apply the 30°C cap only from 205 W.
A single 125 W 4509Y, four large 3.5-inch drives and a 600 W supply make a compact file and print server for a branch. Dell’s quietest acoustic test build also used one 125 W processor and a single 600 W supply, and measured 32 dB at idle.
1 × Xeon Silver 4509Y — 8 cores @ 2.6 GHz, 125 W
8 × 32 GB DDR5-5600 RDIMM — 256 GB (up to 4400 MT/s with this processor)
4 × 12 TB 3.5-inch SATA 7.2K — 48 TB raw
PERC H755, 8 GB NV cache (RAID 5, 6 or 10)
BOSS-N1 boot pair (2 × M.2 NVMe, RAID 1)
Intel 4 × 1GbE BASE-T OCP 3.0
600 W Platinum hot-plug supply (full 600 W on 100–120 V)
Windows Server 2025 · ProSupport 5 years
One-processor systems use DIMM slots A1–A8 only and are limited to two PCIe slots. With one processor and no rear drives Dell specifies five fans. The 4 × 3.5-inch chassis is not supported under ASHRAE A4.
Two 28-core 5520+ processors, linked over UPI at 20 GT/s, give 56 cores in 1U. Of the three 28-core parts in Dell’s table, the 5512U lists no UPI speed and the 5420+ lists 16 GT/s. The 8 × 2.5-inch SAS/SATA chassis is one of the two short R660xs builds, and at 205 W it runs on standard fans with a 35°C inlet limit.
2 × Xeon Gold 5520+ — 28 cores @ 2.2 GHz, 205 W each
16 × 32 GB DDR5-5600 RDIMM — 512 GB (up to 4800 MT/s with this processor)
2 × 960 GB SATA SSD, mirrored
PERC H355 (RAID 0, 1 or 10, no cache)
Broadcom 4 × 25GbE SFP28 OCP 3.0
1100 W Titanium hot-plug supplies (1+1)
Ubuntu Server 24.04 LTS · ProSupport 3 years
In this chassis, quad-port 25GbE OCP cards need 85°C-rated optics drawing 1.2 W or less. Two-processor systems always need seven fans.
If the brief is a two-socket 1U server with modest memory, but DDR5 and PCIe Gen5 are not on it, a re-certified 14G or 13G PowerEdge can fill the same rack slot.
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
The nearest like-for-like: the same 16-slot shape with a ten-bay or four-bay 3.5-inch front, one memory generation back.
677.1 mm ear to rear wall, 712.95 mm to PSU handle (10-bay, 4 × 3.5" and 8 × NVMe) · 626.42 / 661.37 mm (8 × SAS/SATA or no backplane) · 748.79 mm with bezel (spec sheet)
Weight
Up to 19.45 kg (4 × 3.5") · 18.74 kg (10 × 2.5") · 18.25 kg (8 × 2.5") · 15.38 kg (no backplane)
Cooling
Air only
Fans
Standard or HPR Gold · five with one processor and no rear drives, seven otherwise
Bezel
Optional LCD bezel or security bezel
Rails
A11 stab-in/drop-in sliding rails (4-post) · A8 static rails (required for 2-post) · optional CMA and strain relief bar
Processor
Sockets
One or two
Families
4th and 5th Gen Intel Xeon Scalable
Cores per processor
Up to 32 (4th Gen) · up to 28 (5th Gen)
TDP
125–225 W in Dell’s SKU table (250 W quoted as platform maximum)
UPI
Up to 3 links per processor · 16 or 20 GT/s
PCIe lanes
80 × PCIe 5.0 per processor
Chipset
Intel C741
Memory
Slots
16 DDR5 ECC RDIMM · 8 per processor, one DIMM per channel
USB tape, NAS software stack, 12 Gb MD-series JBODs
Expansion & networking
PCIe slots
Up to 3 × Gen4 or 2 × Gen5, low profile, half length · 1 CPU: x16 Gen4 + x8 Gen5
OCP
1 × OCP 3.0 SFF, x8 Gen4 · 1, 10 or 25 GbE, 2 or 4 ports
LOM
2 × 1GbE (Broadcom BCM5720)
GPU
Not supported
Power
Supplies
Up to two, 60 mm, hot-plug, 1+1 redundant
AC options
600 W Platinum · 700 W Titanium (200–240 V) · 800 W Platinum · 1100 W Titanium · 1400 W Titanium or Platinum · 1800 W Titanium (200–240 V)
277 VAC / HVDC
1400 W Titanium
−48 V DC
1100 W, −48 to −60 V DC
Ports & video
Front
1 × USB 2.0 · 1 × VGA · 1 × iDRAC Direct (micro-AB USB)
Rear
1 × USB 2.0 · 1 × USB 3.0 · 1 × VGA · dedicated iDRAC Ethernet · 2 × 1GbE · optional serial
Internal
1 × USB 3.0 (optional)
Video
Integrated Matrox G200, 16 MB
Environment
ASHRAE A2
10–35°C up to 900 m, de-rated 1°C per 300 m above
ASHRAE A3
5–40°C · processors to 185 W (no backplane) or 150 W (other fronts) · no rear drives or BOSS
ASHRAE A4
5–45°C · no-backplane chassis only, processors to 135 W
12 — FAQ
R660xs questions, answered from the documentation
What is the maximum memory of the Dell PowerEdge R660xs?
Sixteen RDIMM slots at one DIMM per channel give 1.5 TB with 16 × 96 GB modules. Dell’s part list shows the 96 GB module only in its 5600 MT/s version, which the guide assigns to 5th Gen Xeon; the largest 4800 MT/s module in that list is 64 GB, or 1 TB across 16 slots.
Which processors does the R660xs support?
Dell’s R660xs table lists 21 SKUs. The 4th Gen Scalable group has thirteen parts reaching 32 cores and the 5th Gen group has eight reaching 28. TDPs run from 125 W to 225 W, the 3408U alone lacks turbo, and the 5512U has no UPI speed listed.
How many drive bays does the R660xs have?
Up to 12: ten 2.5-inch bays at the front plus two 2.5-inch bays at the rear. The front can instead take four 3.5-inch drives (up to 96 TB in Dell’s table) or eight 2.5-inch drives, and a diskless chassis is available. There are no EDSFF E3.S options.
Can the R660xs take a GPU?
No. Dell’s R470 technical guide lists the R660xs as having no GPU support, and its slot priority tables contain no accelerators. For a GPU in a similar two-socket design, the 2U R760xs takes up to two NVIDIA A2 cards.
How many PCIe slots does the R660xs have?
With two processors: three low-profile Gen4 slots (x16 + x8 + x8) or two Gen5 slots (x16 + x8); with one processor, one x16 Gen4 and one x8 Gen5. Networking adds an x8 Gen4 OCP 3.0 slot rated to 25 GbE, and the front PERC needs no slot at all.
Which power supplies can the R660xs use?
Two hot-plug bays hold a 1+1 pair chosen from nine models: AC units of 600, 700, 800, 1100, 1400 (Titanium or Platinum) and 1800 W, and for special feeds an 1100 W (−48 V DC) or 1400 W (277 VAC/HVDC) version. The 700 W and 1800 W supplies need 200–240 V.
How big and heavy is the R660xs?
The chassis measures 42.8 mm by 482 mm (height by width). Depth to the PSU handles is 712.95 mm for the 10-bay, 4 × 3.5-inch and 8 × NVMe builds and 661.37 mm for the 8 × SAS/SATA or diskless chassis; the spec sheet gives 748.79 mm with the bezel. A fully populated 4 × 3.5-inch system weighs up to 19.45 kg.
How does the R660xs differ from the R660?
Both are 1U on the same Xeon generations, but the R660 has 32 DIMM slots and 8 TB, processors reaching 64 cores and 350 W, E3.S drive options, up to three 75 W GPUs and optional liquid cooling. The R660xs trades that headroom for a shorter air-cooled chassis, a 4 × 3.5-inch front and a processor list that stops at 225 W.
How does the R660xs compare with the PowerEdge R470?
Dell’s R470 technical guide compares the R470 directly with the R660xs. The R470 has one Xeon 6 socket (up to 144 E-cores or 86 P-cores), DDR5 rated to 6400 MT/s, as many as 16 E3.S bays, four x16 Gen5 slots and room for four 75 W accelerators; the R660xs keeps two sockets, 5200 MT/s memory and no GPU option.
Is the Dell PowerEdge R660xs end of life?
Dell’s R660xs guide does not publish an end-of-sale or end-of-service date. Its service appendix lists three years of ProSupport Next Business Day as the default cover. Our end-of-life checker records Dell’s dates as they are announced.
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.
