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

Dell XE8640 vs HPE XD685

A specification-by-specification comparison of the Dell PowerEdge XE8640 and the HPE ProLiant Compute XD685, built from Dell’s and HPE’s own documents. 3 headline measures favour the XE8640, 4 favour the XD685, and they share no processors.

Bottom line. XE8640 leads on databases and in-memory work. XD685 leads on virtualisation, storage density, AI and acceleration, network throughput. Neither vendor publishes benchmarks for these machines, so every call here is made on what their documents state.

Dell PowerEdge XE8640 front with eight 2.5-inch NVMe bays above five hot-swap GPU fans, with a control panel at each side
Dell PowerEdge
XE8640
4U Rack2 sockets32 DIMMiDRAC9
Configure the XE8640 →Full data sheet
VS
HPE ProLiant Compute XD685 front: twelve E3.S NVMe bays, NS204 boot module, iLO, VGA and USB 3.0 ports, PCIe bays at each side, badge on the ear
HPE ProLiant
XD685
5U Rack2 sockets24 DIMMHPE iLO 6
Configure the XD685 →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
128
Cores, fully populated
Largest listed processor × its socket count
Higher192
4 TBHigher
Memory ceiling
As each document states it
3 TB
8
Drive bays
Higher12
Up to 4
Accelerators
HigherUp to 8
3,200 WHigher
Largest power supply
3,000 W
4U RackHigher
Rack height
5U Rack
200 GbE class
Fastest network option
Higher400 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 XE8640 if…

  • Memory ceiling: 4 TB against 3 TB on the XD685
  • Largest power supply: 3,200 W against 3,000 W on the XD685
  • Rack height: 4U Rack against 5U Rack on the XD685
  • Four H100 SXM5 GPUs at 700 W each share one HGX board, and Dell quotes up to 900 GB/s of NVLink bandwidth between them.

Choose the XD685 if…

  • Cores, fully populated: 192 against 128 on the XE8640
  • Drive bays: 12 against 8 on the XE8640
  • Accelerators: Up to 8 against Up to 4 on the XE8640
  • Four eight-GPU boards on one platform — NVIDIA HGX H200, B200 and HGX B300, or AMD Instinct MI355X — with B200, B300 and MI355X each tied to its own DLC or power kit.
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.

VirtualisationXE8640: 128 cores with 4 TB. XD685: 192 cores with 3 TB.XD685
Databases & in-memoryMemory ceiling 4 TB against 3 TB, across 32 and 24 DIMM slots.XE8640
Storage density8 bays in 4U against 12 in 5U.XD685
AI & acceleration4 accelerators against 8 in the vendor documents.XD685
Network throughputFastest card listed: 200 GbE class against 400 GbE class.XD685
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.

SpecificationXE8640XD685
Processors listed159
Most cores per processor6496
Highest processor TDP350 W400 W
Processor families4th Gen Xeon Scalable · 5th Gen Xeon ScalableAMD EPYC 9005

Memory

SpecificationXE8640XD685
DIMM slots3224
Slots per processor1612
Fastest rated speed5,600 MT/s6,400 MT/s
Memory typesRDIMM DDR5-4800 · RDIMM 3DS DDR5-4800 · RDIMM DDR5-5600 · RDIMM 3DS DDR5-5600RDIMM DDR5-6400

Storage

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

SpecificationXE8640XD685
Maximum bays812
Documented layouts32
Bay sizes2.5-inch · E3.SE3.S
Boot devicesBOSS-N1 (2 x M.2 NVMe, HW RAID 1)HPE ProLiant Compute XD NS204i-u 960GB Boot Device (S4R99A) - 2x 480 GB M.2 NVMe RAID 1 · HPE ProLiant Compute XD NS204i-u 2x 960GB Boot Device (S6A36A) - 2x 960 GB M.2 NVMe RAID 1

Accelerators & I/O

SpecificationXE8640XD685
Accelerators supportedUp to 4Up to 8
OCP slots10
PCIe network slots412
Network cards listed1820

Power & platform

SpecificationXE8640XD685
Power-supply options21
Output range2,800–3,200 W3,000–3,000 W
Input typesAC · 277 VAC / HVDC−48 V DC
ManagementiDRAC9HPE iLO 6
Chassis depthVendors measure depth differently — see each data sheet865.54 mm ear to PSU handle (spec sheet: 901.4 mm with bezel)1049 mm (L) deep
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.

XE8640: processors by cores and TDP

Dell PowerEdge XE8640 processors0816243240485664150 W200 W250 W300 W350 WCores per processorIntel Xeon Platinum 8480+ — 56 cores / 112 threads · 350 W · 2 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8470 — 52 cores / 104 threads · 350 W · 2 GHz base · 98 MB cache · DDR5-4800Intel Xeon Platinum 8468 — 48 cores / 96 threads · 350 W · 2.1 GHz base · 90 MB cache · DDR5-4800Intel Xeon Platinum 8460Y+ — 40 cores / 80 threads · 300 W · 2 GHz base · 75 MB cache · DDR5-4800Intel Xeon Platinum 8452Y — 36 cores / 72 threads · 300 W · 2 GHz base · 67.5 MB cache · DDR5-4800Intel Xeon Platinum 8462Y+ — 32 cores / 64 threads · 300 W · 2.8 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 6442Y — 24 cores / 48 threads · 225 W · 2.6 GHz base · 45 MB cache · DDR5-4800Intel Xeon Gold 5418Y — 24 cores / 48 threads · 185 W · 2 GHz base · 45 MB cache · DDR5-4400Intel 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 8562Y+ — 32 cores / 64 threads · 300 W · 2.8 GHz base · 60 MB cache · DDR5-5600Intel Xeon Gold 6548Y+ — 32 cores / 64 threads · 250 W · 2.5 GHz base · 60 MB cache · DDR5-5200Intel Xeon Gold 6542Y — 24 cores / 48 threads · 250 W · 2.9 GHz base · 60 MB cache · DDR5-52008592+64 cores · 5.5 W/core — top SKU and most efficient
4th Gen Xeon Scalable 95th Gen Xeon Scalable 6Bubble size = L3 cache · hover a bubble for the full SKU

XD685: processors by cores and TDP

HPE ProLiant Compute XD685 processors081624324048566472808896250 W300 W350 W400 WCores per processorAMD EPYC 9655 — 96 cores · 400 W · 2.6 GHz base · 384 MB cache · DDR5-6400AMD EPYC 9645 — 96 cores · 320 W · 2.3 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9565 — 72 cores · 400 W · 3.15 GHz base · 384 MB cache · DDR5-6400AMD EPYC 9575F — 64 cores · 400 W · 3 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9555 — 64 cores · 360 W · 3.2 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9535 — 64 cores · 300 W · 2.4 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9455 — 48 cores · 300 W · 3.15 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9365 — 36 cores · 300 W · 3.4 GHz base · 192 MB cache · DDR5-6400AMD EPYC 9355 — 32 cores · 280 W · 3.6 GHz base · 256 MB cache · DDR5-6400EPYC 965596 cores — the top SKUEPYC 96453.3 W/core — most efficient
AMD EPYC 9005 9Bubble size = L3 cache · hover a bubble for the full SKU

XE8640: memory with every slot filled

32 GB1 TB64 GB2 TB96 GB3 TB128 GB4 TB32 slots · 16 per processor · each tick = one DIMM

XD685: memory with every slot filled

64 GB1.5 TB96 GB2.3 TB128 GB3 TB24 slots · 12 per processor · each tick = one DIMM

XE8640: drive bays

Front panel

8 × EDSFF NVMe at the front — 8 bays in total.

SAS/SATANVMeSAS/SATA + NVMe

XD685: drive bays

Front panel

8 × EDSFF NVMe at the front — 8 bays in total.

SAS/SATANVMeSAS/SATA + NVMe

XE8640: power supplies

05001000150020002500300035002800 W Titanium — Mixed mode: 200-240 V AC (15.6 A) or 240 V DC (13.6 A); 86 mm; C22 input socket needs C21-to-C20 jumper cord (C20/C19 cords do not fit). 54 V PSU. Four PSUs installed2800Titanium3200 W Titanium — Mixed mode: 277 V AC (13 A) or 336 V DC HVDC (11.5 A); 86 mm; APP 2006G1 cord. Spec sheet lists 260-400 VDC3200TitaniumWatts · dashed line = output at 100–120 V low line
AC277 VAC / HVDC

XD685: power supplies

0500100015002000250030003000 W Titanium — Option name 'HPE ProLiant Compute XD 3000W 54VDC Power Supply' (54VDC = output); Standard Features name 'HPE 3000 W CRPS Titanium Hot Plug Power Supply Kit'. Family: CRPS as printed (not HPE Flex Slot; the doc does not say M-CRPS). Rated input 200-277 VAC; PMAX 2900 W at 200 VAC, 3000 W at 207-277 VAC. Max BTU 6497 BTU/hr @200 VAC, 7230 @220 VAC, 7962 @240 VAC. No -48 VDC or HVDC unit listed. 'The PSU model will differ based on the total number of PSUs in the system.' B200/B300/MI355X configs default to 12 PSUs; 10 PSUs can be deployed where PDUs/manifolds do not allow 12; B200 base 6-PSU (S4X40A) with S6V19A for 12-PSU N+3.3000TitaniumWatts · dashed line = output at 100–120 V low line
−48 V DC
07 — Questions

XE8640 vs XD685, answered

Is the XE8640 or the XD685 the faster server?

Neither document publishes benchmark results, so this page compares what they do state. The XE8640 lists 15 processors up to 64 cores at 350 W; the XD685 lists 9 up to 96 cores at 400 W. Fully populated that is 128 cores against 192.

Which holds more memory?

The XE8640 has 32 DIMM slots and a stated ceiling of 4 TB. The XD685 has 24 and 3.0 TB.

Which takes more drives?

XE8640: 8 bays across 3 documented layouts. XD685: 12 across 2. Counts include rear and mid-chassis positions where the vendor documents them.

Can either take GPUs?

XE8640: up to 4 accelerators, 0 double-wide cards listed. XD685: up to 8, 0 double-wide listed.

Do they share any processors?

No. The two documents list different processors, so a like-for-like processor build is not possible across these two.

Where these figures come from. XE8640: Dell PowerEdge XE8640 Technical Guide (Rev. A05, December 2024) (Dell document). XD685: HPE ProLiant Compute XD685 QuickSpecs (V15 - 03-August-2026) (HPE document). Each claim on this page is derived from those documents, checked page by page on the two data sheets, and carries no pricing.

Other comparisons in this class

R760xa vs XD685Dell vs HPEXE7740 vs XD685Dell vs HPEXE7745 vs XD685Dell vs HPEXE8640 vs Compute XD690Dell vs HPEXE8640 vs SR680a V3Dell vs LenovoXE8640 vs SR780a V3Dell vs LenovoXE9680 vs XD685Dell vs HPEXE9680L vs XD685Dell vs HPE

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