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Head-to-head · every figure from the vendor documents

Dell R660 vs Dell R660xs

A specification-by-specification comparison of the Dell PowerEdge R660 and the Dell PowerEdge R660xs, built from Dell’s own documents. 4 headline measures favour the R660 and none favour the R660xs, and 18 processors appear in both lists.

Bottom line. R660 leads on virtualisation, databases and in-memory work, storage density, AI and acceleration. Neither vendor publishes benchmarks for these machines, so every call here is made on what their documents state.

Dell PowerEdge R660 front view with ten 2.5-inch drive bays, the left control panel, and VGA, USB and power button at the right
Dell PowerEdge
R660
1U Rack2 sockets32 DIMMiDRAC9
Configure the R660 →Full data sheet
VS
Dell PowerEdge R660xs front view of the 4 x 3.5-inch drive system: four large drive carriers, left control panel, VGA port and power button
Dell PowerEdge
R660xs
1U Rack2 sockets16 DIMMiDRAC9
Configure the R660xs →Full data sheet
01 — Scoreboard

The measures that decide it

Each row is a figure both vendors publish. Bars show the split between the two; a badge marks the larger figure, which is not always the better buy — a shallower chassis or a lower power ceiling can matter more.

2
Processor sockets
2
128Higher
Cores, fully populated
Largest listed processor × its socket count
64
8 TBHigher
Memory ceiling
As each document states it
1.5 TB
16Higher
Drive bays
12
Up to 3Higher
Accelerators
None listed
1,800 W
Largest power supply
1,800 W
1U Rack
Rack height
1U Rack
100 GbE class
Fastest network option
100 GbE class
02 — Verdict

Which one, and why

Drawn from the measures above and each model’s own data sheet. Neither vendor publishes benchmark results for these servers, so nothing here claims one is “faster”.

Choose the R660 if…

  • Cores, fully populated: 128 against 64 on the R660xs
  • Memory ceiling: 8 TB against 1.5 TB on the R660xs
  • Drive bays: 16 against 12 on the R660xs
  • 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.

Choose the R660xs if…

  • 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.
03 — By workload

Where each one pulls ahead

Calls made on documented capacity only — cores, memory, bays, accelerators and network options — with the figures behind each one shown.

VirtualisationR660: 128 cores with 8 TB. R660xs: 64 cores with 1.5 TB.R660
Databases & in-memoryMemory ceiling 8 TB against 1.5 TB, across 32 and 16 DIMM slots.R660
Storage density16 bays in 1U against 12 in 1U.R660
AI & acceleration3 accelerators against no in the vendor documents.R660
Network throughputFastest card listed: 100 GbE class against 100 GbE class.Line ball
04 — Specifications

Side by side, differences first

Everything both documents state, grouped. The default view hides rows where the two machines are identical.

Processors

Every processor each vendor lists for the model, from its own document.

SpecificationR660R660xs
Processors listed5121
Most cores per processor6432
Highest processor TDP350 W225 W
Processor familiesXeon Max (HBM) · 4th Gen Xeon Scalable · 5th Gen Xeon Scalable5th Gen Xeon Scalable · 4th Gen Xeon Scalable

Memory

SpecificationR660R660xs
DIMM slots3216
Slots per processor168
Largest module listed256 GB96 GB
Fastest rated speed6,400 MT/s5,600 MT/s
Memory typesRDIMM DDR5-4800 · RDIMM DDR5-5600 · RDIMM DDR5-6400RDIMM DDR5-4800 · RDIMM DDR5-5600

Storage

Bay counts are the maximum each document states, including rear and mid-chassis positions.

SpecificationR660R660xs
Maximum bays1612
Documented layouts1310
Bay sizes2.5-inch · E3.S3.5-inch · 2.5-inch
Boot devicesBOSS-N1BOSS-N1 (2 x M.2 NVMe 480/960 GB, HW RAID 0/1, Marvell 88NR2241, cold-swap internal) · Internal USB

Accelerators & I/O

SpecificationR660R660xs
Accelerators supportedUp to 3None listed
Network cards listed2627

Power & platform

SpecificationR660R660xs
Power-supply options89
Output range700–1,800 W600–1,800 W
Chassis depthVendors measure depth differently — see each data sheet822.88 mm with bezel / 809.04 mm without bezel677.1 mm ear-to-rear-wall (10 x 2.5 / 4 x 3.5 / 8 x NVMe chassis) or 626.42 mm (8 x SAS/SATA or no-backplane chassis)
05 — The data

Processors, memory, bays and power

The same charts each data sheet carries, drawn to the same scale so the two ranges can be read against each other.

R660: processors by cores and TDP

Dell PowerEdge R660 processors0816243240485664100 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

R660xs: processors by cores and TDP

Dell PowerEdge R660xs processors08162432100 W150 W200 W250 WCores per processorIntel Xeon Gold 5520+ — 28 cores / 56 threads · 205 W · 2.2 GHz base · 52.5 MB cache · DDR5-4800Intel Xeon Gold 5512U — 28 cores / 56 threads · 185 W · 2.1 GHz base · 52.5 MB cache · DDR5-4800Intel Xeon Silver 4516Y+ — 24 cores / 48 threads · 185 W · 2.2 GHz base · 45 MB cache · DDR5-4400Intel 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 · DDR5-4400Intel 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 6414U — 32 cores / 64 threads · 185 W · 2 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 Silver 4416+ — 20 cores / 40 threads · 165 W · 2 GHz base · 38 MB cache · DDR5-4000Intel 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 Silver 4410T — 10 cores / 24 threads · 150 W · 2.7 GHz base · 27 MB cache · DDR5-4000Intel 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 · DDR5-40006448Y32 cores — the top SKU6414U5.8 W/core — most efficient
5th Gen Xeon Scalable 84th Gen Xeon Scalable 13Bubble size = L3 cache · hover a bubble for the full SKU

R660: memory with every slot filled

16 GB512 GB32 GB1 TB64 GB2 TB96 GB3 TB128 GB4 TB256 GB8 TB32 slots · 16 per processor · each tick = one DIMM

R660xs: memory with every slot filled

16 GB256 GB32 GB512 GB64 GB1 TB96 GB1.5 TB16 slots · 8 per processor · each tick = one DIMM

R660: drive bays

Front panel

16 × EDSFF NVMe at the front — 16 bays in total.

SAS/SATANVMeSAS/SATA + NVMe

R660xs: drive bays

Front panel

Rear module

10 × 2.5" NVMe at the front, plus 2 × 2.5" SAS/SATA + NVMe at the rear — 12 bays in total.

SAS/SATANVMeSAS/SATA + NVMe

R660: power supplies

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

R660xs: power supplies

0500100015002000600 W Platinum — Mixed mode (100-240 V AC / 240 V DC); 600 W at low line; 60 mm; C13600600Platinum700 W Titanium — Mixed mode HLAC (200-240 V AC / 240 V DC); 60 mm; C13700Titanium800 W Platinum — Mixed mode (100-240 V AC / 240 V DC); 800 W at low line; 60 mm; C13800800Platinum1100 W N/A (-48 V DC) — -48 to -60 V DC input; 60 mm; Lotes DC PSU connector1100DC1100 W Titanium — Mixed mode (100-240 V AC / 240 V DC); 1050 W at low line; 60 mm; C1310501100Titanium1400 W Platinum — Mixed mode (100-240 V AC / 240 V DC); 1050 W at low line; 60 mm; C1310501400Platinum1400 W Titanium — Mixed mode (100-240 V AC / 240 V DC); 1050 W at low line; 60 mm; C1310501400Titanium1400 W Titanium — 277 V AC and HVDC (336 V DC); 60 mm; APP 2006G1 cord1400Titanium1800 W Titanium — Mixed mode HLAC (200-240 V AC / 240 V DC); 60 mm; C151800TitaniumWatts · dashed line = output at 100–120 V low line
AC277 VAC / HVDC−48 V DC
06 — Like for like

18 processors you can order in either

Both vendor documents list these parts, so a build can be matched across the two and the comparison comes down to the chassis: 33 more are exclusive to the R660 and 3 to the R660xs.

ProcessorCoresTDP
Intel Xeon Gold 6414U32250 W
Intel Xeon Gold 6448Y32225 W
Intel Xeon Gold 6438Y+32205 W
Intel Xeon Gold 5420+28205 W
Intel Xeon Gold 5512U28185 W
Intel Xeon Gold 6442Y24225 W
Intel Xeon Gold 5418Y24185 W
Intel Xeon Silver 4416+20165 W
Intel Xeon Gold 6426Y16185 W
Intel Xeon Gold 5416S16150 W
Intel Xeon Gold 6526Y16195 W
Intel Xeon Silver 4514Y16150 W
07 — Questions

R660 vs R660xs, answered

Is the R660 or the R660xs the faster server?

Neither document publishes benchmark results, so this page compares what they do state. The R660 lists 51 processors up to 64 cores at 350 W; the R660xs lists 21 up to 32 cores at 225 W. Fully populated that is 128 cores against 64.

Which holds more memory?

The R660 has 32 DIMM slots and a stated ceiling of 8 TB. The R660xs has 16 and 1.5 TB.

Which takes more drives?

R660: 16 bays across 13 documented layouts. R660xs: 12 across 10. Counts include rear and mid-chassis positions where the vendor documents them.

Can either take GPUs?

R660: up to 3 accelerators, 0 double-wide cards listed. R660xs: no accelerator option in its document.

Do they share any processors?

Yes — 18 processors appear in both documents, including the Intel Xeon Gold 6414U. That makes a like-for-like build possible on either server.

Where these figures come from. R660: Dell PowerEdge R660 Technical Guide (June 2026, Rev. A01) (Dell document). R660xs: Dell PowerEdge R660xs Technical Guide (June 2026, Rev. A05) (Dell document). Each claim on this page is derived from those documents, checked page by page on the two data sheets, and carries no pricing.

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