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

Dell R770 vs Lenovo SR665 V3

A specification-by-specification comparison of the Dell PowerEdge R770 and the Lenovo ThinkSystem SR665 V3, built from Dell’s and Lenovo’s own documents. 3 headline measures favour the R770, 2 favour the SR665 V3, and they share no processors.

Bottom line. R770 leads on virtualisation, databases and in-memory work, storage density. SR665 V3 leads on AI and acceleration. Neither vendor publishes benchmarks for these machines, so every call here is made on what their documents state.

Dell PowerEdge R770 front view with 40 EDSFF E3.S drive bays in five groups of eight between the control panels
Dell PowerEdge
R770
2U Rack2 sockets32 DIMMiDRAC10
Configure the R770 →Full data sheet
VS
Lenovo ThinkSystem SR665 V3 front: 24 numbered 2.5-inch drive bays, VGA and diagnostics ports at left, two USB ports at right
Lenovo ThinkSystem
SR665 V3
2U Rack2 sockets24 DIMMXClarity Controller 2
Configure the SR665 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
288
Cores, fully populated
Largest listed processor × its socket count
Higher320
8 TBHigher
Memory ceiling
As each document states it
6 TB
44Higher
Drive bays
40
Up to 6
Accelerators
HigherUp to 7
3,200 WHigher
Largest power supply
2,600 W
2U Rack
Rack height
2U Rack
400 GbE class
Fastest network option
400 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 R770 if…

  • Memory ceiling: 8 TB against 6 TB on the SR665 V3
  • Drive bays: 44 against 40 on the SR665 V3
  • Largest power supply: 3,200 W against 2,600 W on the SR665 V3
  • Forty front E3.S Gen5 bays plus four at the rear; Dell puts the front alone at 2457.6 TB raw.

Choose the SR665 V3 if…

  • Cores, fully populated: 320 against 288 on the R770
  • Accelerators: Up to 7 against Up to 6 on the R770
  • Lenovo lists 48 processors across two EPYC generations in one chassis, spanning 8 cores (EPYC 9015) to 160 (EPYC 9845) at up to 400 W.
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.

VirtualisationR770: 288 cores with 8 TB. SR665 V3: 320 cores with 6 TB.R770
Databases & in-memoryMemory ceiling 8 TB against 6 TB, across 32 and 24 DIMM slots.R770
Storage density44 bays in 2U against 40 in 2U.R770
AI & acceleration6 accelerators against 7 in the vendor documents.SR665 V3
Network throughputFastest card listed: 400 GbE class against 400 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.

SpecificationR770SR665 V3
Processors listed2348
Most cores per processor144160
Highest processor TDP350 W400 W
Processor familiesXeon 6 E-core · Xeon 6 P-coreAMD EPYC 9005 · AMD EPYC 9004
Single-processor optionNoYes

Memory

SpecificationR770SR665 V3
DIMM slots3224
Slots per processor1612
Memory typesRDIMM DDR5-6400RDIMM 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.

SpecificationR770SR665 V3
Maximum bays4440
Documented layouts1119
Bay sizesE3.S · 2.5-inch3.5-inch · 2.5-inch
Boot devicesBOSS-N1 DC-MHS (HW RAID 1, 2 x M.2 NVMe SSD 480 GB or 960 GB) · M.2 Interposer board (DC-MHS): 2 x M.2 NVMe SSDs · Internal USBM.2 SATA/x4 NVMe 2-Bay Adapter (4Y37A79663) · M.2 NVMe 2-Bay RAID Adapter (4Y37A09750) · M.2 RAID B540i-2i SATA/NVMe Adapter (4Y37A90063) + 4 more
Storage controllers520

Accelerators & I/O

SpecificationR770SR665 V3
Accelerators supportedUp to 6Up to 7
Double-wide cards listed56
OCP slots21
PCIe network slots812
Network cards listed1432

Power & platform

SpecificationR770SR665 V3
Power-supply options1110
Output range800–3,200 W750–2,600 W
Input typesAC · 277 VAC / HVDCAC · −48 V DC
ManagementiDRAC10XClarity Controller 2
Chassis depthVendors measure depth differently — see each data sheet801.51 mm without bezel (rear I/O) / 814.52 mm without bezel (front I/O)766 mm
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.

R770: processors by cores and TDP

Dell PowerEdge R770 processors081624324048566472808896104112120128136144150 W200 W250 W300 W350 WCores per processorIntel Xeon 6 6780E — 144 cores / 144 threads · 330 W · 2.2 GHz base · 108 MB cache · DDR5-6400Intel Xeon 6 6766E — 144 cores / 144 threads · 250 W · 1.9 GHz base · 108 MB cache · DDR5-6400Intel Xeon 6 6756E — 128 cores / 128 threads · 225 W · 1.8 GHz base · 96 MB cache · DDR5-6400Intel Xeon 6 6746E — 112 cores / 112 threads · 250 W · 2 GHz base · 96 MB cache · DDR5-6400Intel Xeon 6 6740E — 96 cores / 96 threads · 250 W · 2.4 GHz base · 96 MB cache · DDR5-6400Intel Xeon 6 6710E — 64 cores / 64 threads · 205 W · 2.4 GHz base · 96 MB cache · DDR5-6400Intel Xeon 6 6787P — 86 cores / 172 threads · 350 W · 2 GHz base · 336 MB cache · DDR5-6400Intel Xeon 6 6767P — 64 cores / 128 threads · 350 W · 2.4 GHz base · 336 MB cache · DDR5-6400Intel Xeon 6 6760P — 64 cores / 128 threads · 330 W · 2.2 GHz base · 320 MB cache · DDR5-6400Intel Xeon 6 6747P — 48 cores / 96 threads · 330 W · 2.7 GHz base · 288 MB cache · DDR5-6400Intel Xeon 6 6740P — 48 cores / 96 threads · 270 W · 2.1 GHz base · 288 MB cache · DDR5-6400Intel Xeon 6 6736P — 36 cores / 72 threads · 205 W · 2 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6737P — 32 cores / 64 threads · 270 W · 2.9 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6730P — 32 cores / 64 threads · 250 W · 2.5 GHz base · 288 MB cache · DDR5-6400Intel Xeon 6 6530P — 32 cores / 64 threads · 225 W · 2.3 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6527P — 24 cores / 48 threads · 255 W · 3 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6520P — 24 cores / 48 threads · 210 W · 2.4 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6724P — 16 cores / 32 threads · 210 W · 3.6 GHz base · 72 MB cache · DDR5-6400Intel Xeon 6 6517P — 16 cores / 32 threads · 190 W · 3.2 GHz base · 72 MB cache · DDR5-6400Intel Xeon 6 6515P — 16 cores / 32 threads · 150 W · 2.3 GHz base · 72 MB cache · DDR5-6400Intel Xeon 6 6505P — 12 cores / 24 threads · 150 W · 2.2 GHz base · 48 MB cache · DDR5-6400Intel Xeon 6 6714P — 8 cores / 16 threads · 165 W · 4 GHz base · 48 MB cache · DDR5-6400Intel Xeon 6 6507P — 8 cores / 16 threads · 150 W · 3.5 GHz base · 48 MB cache · DDR5-64006 6780E144 cores — the top SKU6 6766E1.7 W/core — most efficient
Xeon 6 E-core 6Xeon 6 P-core 17Bubble size = L3 cache · hover a bubble for the full SKU

SR665 V3: processors by cores and TDP

Lenovo ThinkSystem SR665 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 9654P — 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 9554P — 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 23Bubble size = L3 cache · hover a bubble for the full SKU

R770: 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

SR665 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

R770: drive bays

Front panel

40 × EDSFF NVMe at the front — 40 bays in total.

SAS/SATANVMeSAS/SATA + NVMe

SR665 V3: drive bays

Front panel

24 × 2.5" SAS/SATA at the front — 24 bays in total.

SAS/SATANVMeSAS/SATA + NVMe

R770: power supplies

0500100015002000250030003500800 W Platinum — mixed mode 100-240 VAC or 240 VDC; 60 mm800Platinum800 W Titanium — mixed mode 100-240 VAC or 240 VDC; 60 mm800Titanium1100 W Platinum — mixed mode 100-240 VAC or 240 VDC (1050 W lowline); 60 mm1100Platinum1100 W Titanium — mixed mode 100-240 VAC or 240 VDC (1050 W lowline); 60 mm1100Titanium1400 W N/A (DC) — -48 to -60 VDC; Lotes RN5T2 connector; 60 mm1400DC1500 W Titanium — mixed mode 100-240 VAC or 240 VDC (1050 W lowline); 60 mm1500Titanium1500 W Titanium — 277 VAC or 336 VDC HVDC; 60 mm; not available at September 2025 launch1500Titanium1800 W Titanium — HLAC 200-240 VAC / 240 HVDC; 60 mm; not available at September 2025 launch1800Titanium2400 W Titanium — mixed mode 100-240 VAC (1400 W lowline) or 240 VDC; 73.5 mm; C19; not available at September 2025 launch2400Titanium3200 W Titanium — mixed mode 200-240 VAC (2900 W at 200-220 V, 3200 W at 220.1-240 V) or 240 VDC; 73.5 mm; C193200Titanium3200 W Titanium — 277 VAC or 336 VDC HVDC; 73.5 mm; APP/Saf-D-Grid3200TitaniumWatts · dashed line = output at 100–120 V low line
AC277 VAC / HVDC

SR665 V3: power supplies

050010001500200025003000750 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 21800Titanium2400 W Platinum — AC input power - 80 PLUS Platinum efficiency; input 230V; max quantity 22400Platinum2600 W Titanium — AC input power - 80 PLUS Titanium efficiency; input 230V; max quantity 22600TitaniumWatts · dashed line = output at 100–120 V low line
AC−48 V DC
07 — Questions

R770 vs SR665 V3, answered

Is the R770 or the SR665 V3 the faster server?

Neither document publishes benchmark results, so this page compares what they do state. The R770 lists 23 processors up to 144 cores at 350 W; the SR665 V3 lists 48 up to 160 cores at 400 W. Fully populated that is 288 cores against 320.

Which holds more memory?

The R770 has 32 DIMM slots and a stated ceiling of 8 TB. The SR665 V3 has 24 and 6 TB.

Which takes more drives?

R770: 44 bays across 11 documented layouts. SR665 V3: 40 across 19. Counts include rear and mid-chassis positions where the vendor documents them.

Can either take GPUs?

R770: up to 6 accelerators, 5 double-wide cards listed. SR665 V3: up to 7, 6 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. R770: Dell PowerEdge R770 Technical Guide (May 2026) (Dell document). SR665 V3: Lenovo ThinkSystem SR665 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

R760 vs SR665 V3Dell vs LenovoR7625 vs SR665 V3Dell vs LenovoR770 vs DL385 Gen11Dell vs HPER770 vs DL380 Gen12Dell vs HPER770 vs SR650 V3Dell vs LenovoR770AP vs SR665 V3Dell vs LenovoR7725 vs SR665 V3Dell vs LenovoR7725xd vs SR665 V3Dell vs Lenovo

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