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

Dell R6625 vs Lenovo SR645 V3

A specification-by-specification comparison of the Dell PowerEdge R6625 and the Lenovo ThinkSystem SR645 V3, built from Dell’s and Lenovo’s own documents. None of the headline measures favour the R6625; 3 favour the SR645 V3, and 19 processors appear in both lists.

Bottom line. SR645 V3 leads on virtualisation, 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 R6625 front view with ten 2.5-inch drive bays, the left control panel and VGA, USB and power button on the right
Dell PowerEdge
R6625
1U Rack2 sockets24 DIMMiDRAC9
Configure the R6625 →Full data sheet
VS
Lenovo ThinkSystem SR645 V3 1U front with ten 2.5-inch hot-swap drive bays, two front USB ports, a VGA port and the model label
Lenovo ThinkSystem
SR645 V3
1U Rack2 sockets24 DIMMXClarity Controller 2
Configure the SR645 V3 →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
256
Cores, fully populated
Largest listed processor × its socket count
Higher320
6 TB
Memory ceiling
As each document states it
6 TB
16
Drive bays
16
Up to 2
Accelerators
HigherUp to 5
1,800 W
Largest power supply
1,800 W
1U Rack
Rack height
1U Rack
100 GbE class
Fastest network option
Higher200 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 R6625 if…

  • Two sockets in one rack unit: a pair of 128-core 9754s gives 256 cores, and Dell rates them for air at 30°C with the 8 × 2.5-inch NVMe front or no backplane.

Choose the SR645 V3 if…

  • Cores, fully populated: 320 against 256 on the R6625
  • Accelerators: Up to 5 against Up to 2 on the R6625
  • Fastest network option: 200 GbE class against 100 GbE class on the R6625
  • Two EPYC sockets in one rack unit: a pair of 160-core 9845s gives 320 cores, and each processor drives its own 12 DDR5 channels.
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.

VirtualisationR6625: 256 cores with 6 TB. SR645 V3: 320 cores with 6 TB.SR645 V3
Databases & in-memoryMemory ceiling 6 TB against 6 TB, across 24 and 24 DIMM slots.Line ball
Storage density16 bays in 1U against 16 in 1U.Line ball
AI & acceleration2 accelerators against 5 in the vendor documents.SR645 V3
Network throughputFastest card listed: 100 GbE class against 200 GbE class.SR645 V3
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.

SpecificationR6625SR645 V3
Processors listed1946
Most cores per processor128160
Highest processor TDP360 W400 W
Processor familiesAMD EPYC 9004AMD EPYC 9005 · AMD EPYC 9004

Memory

SpecificationR6625SR645 V3
Memory typesRDIMM DDR5-4800 · RDIMM DDR5-5600 · RDIMM DDR5-6400 · 3DS RDIMM DDR5RDIMM DDR5-6400 (5th Gen EPYC) · RDIMM DDR5-4800 (4th Gen EPYC) · 9x4 RDIMM · 3DS RDIMM DDR5-6400

Storage

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

SpecificationR6625SR645 V3
Documented layouts1419
Bay sizes3.5-inch · 2.5-inch · E3.S3.5-inch · E3.S · 2.5-inch
Boot devicesBOSS-N1 · IDSDMM.2 SATA/NVMe 2-Bay Enablement Kit (4Y37A09738) · M.2 SATA/x4 NVMe 2-Bay Adapter (4Y37A79663) · M.2 NVMe 2-Bay RAID Adapter (4Y37A09750) + 1 more
Storage controllers1018

Accelerators & I/O

SpecificationR6625SR645 V3
Accelerators supportedUp to 2Up to 5
PCIe network slots35
Network cards listed1730

Power & platform

SpecificationR6625SR645 V3
Power-supply options78
Output range800–1,800 W750–1,800 W
Input typesAC · −48 V DC · 277 VAC / HVDCAC · −48 V DC
ManagementiDRAC9XClarity Controller 2
Chassis depthVendors measure depth differently — see each data sheet822.89 mm with bezel / 809.05 mm without bezel—
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.

R6625: processors by cores and TDP

Dell PowerEdge R6625 processors081624324048566472808896104112120128200 W250 W300 W350 W400 WCores per processorAMD EPYC 9754 — 128 cores / 256 threads · 360 W · 2.25 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9734 — 112 cores / 224 threads · 340 W · 2.2 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9654 — 96 cores / 192 threads · 360 W · 2.4 GHz base · 384 MB cache · DDR5-4800AMD EPYC 9684X — 96 cores / 192 threads · 320 W · 2.55 GHz base · 1152 MB cache · DDR5-4800AMD EPYC 9634 — 84 cores / 168 threads · 290 W · 2.25 GHz base · 384 MB cache · DDR5-4800AMD EPYC 9554 — 64 cores / 128 threads · 360 W · 3.1 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9534 — 64 cores / 128 threads · 280 W · 2.45 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9474F — 48 cores / 96 threads · 360 W · 3.6 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9454 — 48 cores / 96 threads · 290 W · 2.75 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9384X — 32 cores / 64 threads · 320 W · 3.1 GHz base · 768 MB cache · DDR5-4800AMD EPYC 9374F — 32 cores / 64 threads · 320 W · 3.85 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9354 — 32 cores / 64 threads · 280 W · 3.25 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9334 — 32 cores / 64 threads · 210 W · 2.7 GHz base · 128 MB cache · DDR5-4800AMD EPYC 9274F — 24 cores / 48 threads · 320 W · 4.05 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9254 — 24 cores / 48 threads · 200 W · 2.9 GHz base · 128 MB cache · DDR5-4800AMD EPYC 9224 — 24 cores / 48 threads · 200 W · 2.5 GHz base · 384 MB cache · DDR5-4800AMD EPYC 9184X — 16 cores / 32 threads · 320 W · 3.55 GHz base · 768 MB cache · DDR5-4800AMD EPYC 9174F — 16 cores / 32 threads · 320 W · 4.1 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9124 — 16 cores / 32 threads · 200 W · 3 GHz base · 64 MB cache · DDR5-4800EPYC 9754128 cores · 2.8 W/core — top SKU and most efficient
AMD EPYC 9004 19Bubble size = L3 cache · hover a bubble for the full SKU

SR645 V3: processors by cores and TDP

Lenovo ThinkSystem SR645 V3 processors081624324048566472808896104112120128136144152160100 W150 W200 W250 W300 W350 W400 WCores per processorAMD EPYC 9845 — 160 cores / 320 threads · 390 W · 2.1 GHz base · 320 MB cache · DDR5-6400AMD EPYC 9825 — 144 cores / 288 threads · 390 W · 2.2 GHz base · 384 MB cache · DDR5-6400AMD EPYC 9745 — 128 cores / 256 threads · 400 W · 2.4 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9655 — 96 cores / 192 threads · 400 W · 2.6 GHz base · 384 MB cache · DDR5-6400AMD EPYC 9655P — 96 cores / 192 threads · 400 W · 2.6 GHz base · 384 MB cache · DDR5-6400AMD EPYC 9645 — 96 cores / 192 threads · 320 W · 2.3 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9565 — 72 cores / 144 threads · 400 W · 3.15 GHz base · 384 MB cache · DDR5-6400AMD EPYC 9575F — 64 cores / 128 threads · 400 W · 3.3 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9555 — 64 cores / 128 threads · 360 W · 3.2 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9555P — 64 cores / 128 threads · 360 W · 3.2 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9535 — 64 cores / 128 threads · 300 W · 2.4 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9475F — 48 cores / 96 threads · 400 W · 3.65 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9455 — 48 cores / 96 threads · 300 W · 3.15 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9455P — 48 cores / 96 threads · 300 W · 3.15 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9365 — 36 cores / 72 threads · 300 W · 3.4 GHz base · 192 MB cache · DDR5-6400AMD EPYC 9375F — 32 cores / 64 threads · 320 W · 3.8 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9355 — 32 cores / 64 threads · 280 W · 3.55 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9355P — 32 cores / 64 threads · 280 W · 3.55 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9335 — 32 cores / 64 threads · 210 W · 3 GHz base · 128 MB cache · DDR5-6400AMD EPYC 9275F — 24 cores / 48 threads · 320 W · 4.1 GHz base · 256 MB cache · DDR5-6400AMD EPYC 9255 — 24 cores / 48 threads · 200 W · 3.25 GHz base · 128 MB cache · DDR5-6400AMD EPYC 9175F — 16 cores / 32 threads · 320 W · 4.2 GHz base · 512 MB cache · DDR5-6400AMD EPYC 9135 — 16 cores / 32 threads · 200 W · 3.65 GHz base · 64 MB cache · DDR5-6400AMD EPYC 9115 — 16 cores / 32 threads · 125 W · 2.6 GHz base · 64 MB cache · DDR5-6400AMD EPYC 9015 — 8 cores / 16 threads · 125 W · 3.6 GHz base · 64 MB cache · DDR5-6400AMD EPYC 9754 — 128 cores / 256 threads · 360 W · 2.25 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9734 — 112 cores / 224 threads · 340 W · 2.2 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9684X — 96 cores / 192 threads · 400 W · 2.55 GHz base · 1150 MB cache · DDR5-4800AMD EPYC 9654 — 96 cores / 192 threads · 360 W · 2.4 GHz base · 384 MB cache · DDR5-4800AMD EPYC 9634 — 84 cores / 168 threads · 290 W · 2.25 GHz base · 384 MB cache · DDR5-4800AMD EPYC 9554 — 64 cores / 128 threads · 360 W · 3.1 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9534 — 64 cores / 128 threads · 280 W · 2.45 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9474F — 48 cores / 96 threads · 360 W · 3.6 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9454 — 48 cores / 96 threads · 290 W · 2.75 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9454P — 48 cores / 96 threads · 290 W · 2.75 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9374F — 32 cores / 64 threads · 320 W · 3.85 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9384X — 32 cores / 64 threads · 320 W · 3.1 GHz base · 768 MB cache · DDR5-4800AMD EPYC 9354 — 32 cores / 64 threads · 280 W · 3.25 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9354P — 32 cores / 64 threads · 280 W · 3.25 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9334 — 32 cores / 64 threads · 210 W · 2.7 GHz base · 128 MB cache · DDR5-4800AMD EPYC 9274F — 24 cores / 48 threads · 320 W · 4.05 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9224 — 24 cores / 48 threads · 200 W · 2.5 GHz base · 64 MB cache · DDR5-4800AMD EPYC 9254 — 24 cores / 48 threads · 200 W · 2.9 GHz base · 128 MB cache · DDR5-4800AMD EPYC 9174F — 16 cores / 32 threads · 320 W · 4.1 GHz base · 256 MB cache · DDR5-4800AMD EPYC 9184X — 16 cores / 32 threads · 320 W · 3.55 GHz base · 768 MB cache · DDR5-4800AMD EPYC 9124 — 16 cores / 32 threads · 200 W · 3 GHz base · 64 MB cache · DDR5-4800EPYC 9845160 cores · 2.4 W/core — top SKU and most efficient
AMD EPYC 9005 25AMD EPYC 9004 21Bubble size = L3 cache · hover a bubble for the full SKU

R6625: memory with every slot filled

16 GB384 GB32 GB768 GB64 GB1.5 TB96 GB2.3 TB128 GB3 TB256 GB6 TB24 slots · 12 per processor · each tick = one DIMM

SR645 V3: memory with every slot filled

16 GB384 GB32 GB768 GB64 GB1.5 TB96 GB2.3 TB128 GB3 TB256 GB6 TB24 slots · 12 per processor · each tick = one DIMM

R6625: drive bays

Front panel

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

SAS/SATANVMeSAS/SATA + NVMe

SR645 V3: drive bays

Front panel

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

SAS/SATANVMeSAS/SATA + NVMe

R6625: power supplies

0500100015002000800 W Platinum — Mixed mode (100-240 V AC / 240 V HVDC); 60 mm800Platinum1100 W N/A (-48 V DC) — LVDC -48 to -60 V DC input; 60 mm1100DC1100 W Titanium — Mixed mode (100-240 V AC / 240 V HVDC); 1050 W at low line; 60 mm10501100Titanium1400 W Platinum — Mixed mode (100-240 V AC / 240 V HVDC); 1050 W at low line; 60 mm10501400Platinum1400 W Titanium — Mixed mode (100-240 V AC / 240 V HVDC); 1050 W at low line; 60 mm10501400Titanium1400 W Titanium — Mixed mode 277 V AC or 336 V HVDC (Table 2 only; not in Tables 33/34)1400Titanium1800 W Titanium — Mixed mode (Table 2: 100-240 V AC / 240 V HVDC; spec sheet: 200-240 V AC); no low-line rating (highline only per Table 33); 60 mm1800TitaniumWatts · dashed line = output at 100–120 V low line
AC277 VAC / HVDC−48 V DC

SR645 V3: power supplies

0500100015002000750 W Platinum — AC input power - 80 PLUS Platinum efficiency; input 230V/115V; max quantity 2750Platinum750 W Titanium — AC input power - 80 PLUS Titanium efficiency; input 230V; max quantity 2750Titanium750 W Titanium — AC input power - 80 PLUS Titanium efficiency; input 230V; max quantity 2750Titanium1100 W n/a (DC input) — -48V DC input power; input -48V DC; max quantity 21100DC1100 W Platinum — AC input power - 80 PLUS Platinum efficiency; input 230V/115V; max quantity 21100Platinum1100 W Titanium — AC input power - 80 PLUS Titanium efficiency; input 230V; max quantity 21100Titanium1800 W Platinum — AC input power - 80 PLUS Platinum efficiency; input 230V; max quantity 21800Platinum1800 W Titanium — AC input power - 80 PLUS Titanium efficiency; input 230V; max quantity 21800TitaniumWatts · dashed line = output at 100–120 V low line
AC−48 V DC
06 — Like for like

19 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: 0 more are exclusive to the R6625 and 27 to the SR645 V3.

ProcessorCoresTDP
AMD EPYC 9754128360 W
AMD EPYC 9734112340 W
AMD EPYC 9684X96320 W
AMD EPYC 965496360 W
AMD EPYC 963484290 W
AMD EPYC 955464360 W
AMD EPYC 953464280 W
AMD EPYC 945448290 W
AMD EPYC 9474F48360 W
AMD EPYC 9384X32320 W
AMD EPYC 935432280 W
AMD EPYC 933432210 W
07 — Questions

R6625 vs SR645 V3, answered

Is the R6625 or the SR645 V3 the faster server?

Neither document publishes benchmark results, so this page compares what they do state. The R6625 lists 19 processors up to 128 cores at 360 W; the SR645 V3 lists 46 up to 160 cores at 400 W. Fully populated that is 256 cores against 320.

Which holds more memory?

The R6625 has 24 DIMM slots and a stated ceiling of 6 TB. The SR645 V3 has 24 and 6 TB.

Which takes more drives?

R6625: 16 bays across 14 documented layouts. SR645 V3: 16 across 19. Counts include rear and mid-chassis positions where the vendor documents them.

Can either take GPUs?

R6625: up to 2 accelerators, 0 double-wide cards listed. SR645 V3: up to 5, 0 double-wide listed.

Do they share any processors?

Yes — 19 processors appear in both documents, including the AMD EPYC 9754. That makes a like-for-like build possible on either server.

Where these figures come from. R6625: Dell PowerEdge R6625 Technical Guide (July 2026, Rev. A07) (Dell document). SR645 V3: Lenovo ThinkSystem SR645 V3 Server Product Guide (publication date is not printed in the text export; guide contains 'New as of July 2026' notes) (Lenovo 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

R6625 vs DL365 Gen11Dell vs HPER6625 vs DL360 Gen12Dell vs HPER6625 vs SR630 V4Dell vs LenovoR670 vs SR645 V3Dell vs LenovoR6725 vs SR645 V3Dell vs LenovoDL360 Gen12 vs SR645 V3HPE vs LenovoDL365 Gen11 vs SR645 V3HPE vs LenovoR6625 vs XD230Dell vs HPE

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