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

Lenovo SR650 V3 vs Lenovo SR650a V4

A specification-by-specification comparison of the Lenovo ThinkSystem SR650 V3 and the Lenovo ThinkSystem SR650a V4, built from Lenovo’s own documents. 1 headline measure favours the SR650 V3, 3 favour the SR650a V4, and they share no processors.

Bottom line. SR650 V3 leads on storage density. SR650a V4 leads on virtualisation, network throughput. Neither vendor publishes benchmarks for these machines, so every call here is made on what their documents state.

Lenovo ThinkSystem SR650 V3 front view with 24 numbered 2.5-inch hot-swap drive bays and the front USB and VGA ports
Lenovo ThinkSystem
SR650 V3
2U Rack2 sockets32 DIMMXClarity Controller 2
Configure the SR650 V3 →Full data sheet
VS
Lenovo ThinkSystem SR650a V4 front view: eight 2.5-inch hot-swap drive bays in the centre between the perforated covers of the front GPU slots
Lenovo ThinkSystem
SR650a V4
2U Rack2 sockets32 DIMMXClarity Controller 3
Configure the SR650a V4 →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
Higher172
8 TB
Memory ceiling
As each document states it
8 TB
40Higher
Drive bays
8
Up to 8
Accelerators
Up to 8
2,600 W
Largest power supply
Higher3,200 W
2U Rack
Rack height
2U Rack
200 GbE class
Fastest network option
Higher800 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 SR650 V3 if…

  • Drive bays: 40 against 8 on the SR650a V4
  • Three drive zones — front, mid-chassis and rear — take the 2U chassis to 40 × 2.5-inch or 20 × 3.5-inch bays, and up to 36 NVMe drives can each run on a dedicated x4 link with no oversubscription.

Choose the SR650a V4 if…

  • Cores, fully populated: 172 against 128 on the SR650 V3
  • Largest power supply: 3,200 W against 2,600 W on the SR650 V3
  • Fastest network option: 800 GbE class against 200 GbE class on the SR650 V3
  • One 2U chassis spans eight low-profile L4 cards, four double-wide cards of up to 450 W, or a pair of 600 W H200 NVL or RTX PRO 6000 Blackwell GPUs, all in PCIe 5.0 front slots.
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.

VirtualisationSR650 V3: 128 cores with 8 TB. SR650a V4: 172 cores with 8 TB.SR650a V4
Databases & in-memoryMemory ceiling 8 TB against 8 TB, across 32 and 32 DIMM slots.Line ball
Storage density40 bays in 2U against 8 in 2U.SR650 V3
AI & acceleration8 accelerators against 8 in the vendor documents.Line ball
Network throughputFastest card listed: 200 GbE class against 800 GbE class.SR650a V4
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.

SpecificationSR650 V3SR650a V4
Processors listed8427
Most cores per processor6486
Highest processor TDP385 W350 W
Processor families5th Gen Xeon Scalable · 4th Gen Xeon ScalableXeon 6 P-core

Memory

SpecificationSR650 V3SR650a V4
Fastest rated speed5,600 MT/s8,800 MT/s
Memory typesRDIMM DDR5-5600 · RDIMM DDR5-4800 · 9x4 RDIMM · 3DS RDIMM DDR5-5600RDIMM DDR5-6400 · 3DS RDIMM DDR5-6400 · MRDIMM DDR5-8800 (operates at 8000)

Storage

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

SpecificationSR650 V3SR650a V4
Maximum bays408
Documented layouts204
Bay sizes3.5-inch · 2.5-inch2.5-inch · E3.S
Boot devicesM.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 moreThinkSystem M.2 RAID B550i-2i SATA/NVMe Enablement Kit (internal, 2x M.2 NVMe, integrated Broadcom RAID) · ThinkSystem M.2 RAID B545i-2i SATA/NVMe Adapter (internal, 2x M.2 SATA/NVMe, integrated Broadcom RAID) · ThinkSystem M.2 B350i-2i NVMe Enablement Kit (internal, 2x M.2 NVMe x2, VROC RAID) + 4 more
Storage controllers2223

Accelerators & I/O

SpecificationSR650 V3SR650a V4
Double-wide cards listed14
OCP slots12
PCIe network slots1214

Power & platform

SpecificationSR650 V3SR650a V4
Power-supply options1114
Output range750–2,600 W800–3,200 W
Input typesAC · −48 V DCAC · 277 VAC / HVDC · −48 V DC
ManagementXClarity Controller 2XClarity Controller 3
Chassis depthVendors measure depth differently — see each data sheet766 mm924 mm (36.4 in.)
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.

SR650 V3: processors by cores and TDP

Lenovo ThinkSystem SR650 V3 processors0816243240485664100 W150 W200 W250 W300 W350 W400 WCores per processorIntel Xeon Platinum 8593Q — 64 cores / 128 threads · 385 W · 2.2 GHz base · 320 MB cache · DDR5-5600Intel Xeon Platinum 8592+ — 64 cores / 128 threads · 350 W · 1.9 GHz base · 320 MB cache · DDR5-5600Intel Xeon Platinum 8592V — 64 cores / 128 threads · 330 W · 2 GHz base · 320 MB cache · DDR5-4800Intel Xeon Platinum 8580 — 60 cores / 120 threads · 350 W · 2 GHz base · 300 MB cache · DDR5-5600Intel Xeon Platinum 8581V — 60 cores / 120 threads · 270 W · 2 GHz base · 300 MB cache · DDR5-4800Intel Xeon Platinum 8570 — 56 cores / 112 threads · 350 W · 2.1 GHz base · 300 MB cache · DDR5-5600Intel Xeon Platinum 8571N — 52 cores / 104 threads · 300 W · 2.4 GHz base · 300 MB cache · DDR5-4800Intel Xeon Platinum 8558P — 48 cores / 96 threads · 350 W · 2.7 GHz base · 260 MB cache · DDR5-5600Intel Xeon Platinum 8568Y+ — 48 cores / 96 threads · 350 W · 2.3 GHz base · 300 MB cache · DDR5-5600Intel Xeon Platinum 8558 — 48 cores / 96 threads · 330 W · 2.1 GHz base · 260 MB cache · DDR5-5200Intel Xeon Platinum 8558U — 48 cores / 96 threads · 300 W · 2 GHz base · 260 MB cache · DDR5-4800Intel Xeon Gold 6554S — 36 cores / 72 threads · 270 W · 2.2 GHz base · 180 MB cache · DDR5-5200Intel Xeon Gold 6558Q — 32 cores / 64 threads · 350 W · 3.2 GHz base · 60 MB cache · DDR5-5200Intel Xeon Platinum 8562Y+ — 32 cores / 64 threads · 300 W · 2.8 GHz base · 60 MB cache · DDR5-5600Intel Xeon Gold 6530 — 32 cores / 64 threads · 270 W · 2.1 GHz base · 160 MB cache · DDR5-4800Intel 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 6538Y+ — 32 cores / 64 threads · 225 W · 2.2 GHz base · 60 MB cache · DDR5-5200Intel Xeon Gold 6538N — 32 cores / 64 threads · 205 W · 2.1 GHz base · 60 MB cache · DDR5-5200Intel 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 Gold 6542Y — 24 cores / 48 threads · 250 W · 2.9 GHz base · 60 MB cache · DDR5-5200Intel Xeon Silver 4516Y+ — 24 cores / 48 threads · 185 W · 2.2 GHz base · 45 MB cache · DDR5-4400Intel Xeon Gold 6544Y — 16 cores / 32 threads · 270 W · 3.6 GHz base · 45 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 Silver 4510T — 12 cores / 24 threads · 115 W · 2 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 Gold 5515+ — 8 cores / 16 threads · 165 W · 3.2 GHz base · 22.5 MB cache · DDR5-4800Intel Xeon Bronze 3508U — 8 cores / 8 threads · 125 W · 2.1 GHz base · 22.5 MB cache · DDR5-4400Intel Xeon Silver 4509Y — 8 cores / 16 threads · 125 W · 2.6 GHz base · 22.5 MB cache · DDR5-4400Intel Xeon Platinum 8490H — 60 cores / 120 threads · 350 W · 1.9 GHz base · 112.5 MB cache · DDR5-4800Intel Xeon Platinum 8480+ — 56 cores / 112 threads · 350 W · 2 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8480CL — 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 · 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 8470N — 52 cores / 104 threads · 300 W · 1.7 GHz base · 97.5 MB cache · DDR5-4800Intel Xeon Platinum 8468 — 48 cores / 96 threads · 350 W · 2.1 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8468H — 48 cores / 96 threads · 330 W · 2.1 GHz base · 105 MB cache · DDR5-4800Intel Xeon Platinum 8468V — 48 cores / 96 threads · 330 W · 2.4 GHz base · 97.5 MB cache · DDR5-4800Intel Xeon Platinum 8461V — 48 cores / 96 threads · 300 W · 2.2 GHz base · 97.5 MB cache · DDR5-4800Intel Xeon Platinum 8458P — 44 cores / 88 threads · 350 W · 2.7 GHz base · 82.5 MB cache · DDR5-4800Intel Xeon Platinum 8460H — 40 cores / 80 threads · 330 W · 2.2 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 · 67.5 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 6430 — 32 cores / 64 threads · 270 W · 2.1 GHz base · 60 MB cache · DDR5-4400Intel Xeon Gold 6454S — 32 cores / 64 threads · 270 W · 2.2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Platinum 8454H — 32 cores / 64 threads · 270 W · 2.1 GHz base · 82.5 MB cache · DDR5-4800Intel Xeon Gold 6414U — 32 cores / 64 threads · 250 W · 2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6448H — 32 cores / 64 threads · 250 W · 2.4 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6448Y — 32 cores / 64 threads · 225 W · 2.1 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6433N — 32 cores / 64 threads · 205 W · 2 GHz base · 60 MB cache · DDR5-4400Intel Xeon Gold 6438M — 32 cores / 64 threads · 205 W · 2.2 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 6438Y+ — 32 cores / 64 threads · 205 W · 2 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 6443N — 32 cores / 64 threads · 195 W · 1.6 GHz base · 60 MB cache · DDR5-4400Intel Xeon Gold 6428N — 32 cores / 64 threads · 185 W · 1.8 GHz base · 60 MB cache · DDR5-4000Intel Xeon Platinum 8450H — 28 cores / 56 threads · 250 W · 2 GHz base · 75 MB cache · DDR5-4800Intel Xeon Gold 5420+ — 28 cores / 56 threads · 205 W · 2 GHz base · 52.5 MB cache · DDR5-4400Intel Xeon Gold 6423N — 28 cores / 56 threads · 195 W · 2 GHz base · 52.5 MB cache · DDR5-4400Intel Xeon Gold 6442Y — 24 cores / 48 threads · 225 W · 2.6 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 5412U — 24 cores / 48 threads · 185 W · 2.1 GHz base · 45 MB cache · DDR5-4400Intel Xeon Gold 5418Y — 24 cores / 48 threads · 185 W · 2 GHz base · 45 MB cache · DDR5-4400Intel Xeon Gold 6403N — 24 cores / 48 threads · 185 W · 1.9 GHz base · 45 MB cache · DDR5-4000Intel Xeon Gold 6418H — 24 cores / 48 threads · 185 W · 2.1 GHz base · 60 MB cache · DDR5-4800Intel Xeon Gold 5411N — 24 cores / 48 threads · 165 W · 1.9 GHz base · 45 MB cache · DDR5-4400Intel Xeon Gold 5418N — 24 cores / 48 threads · 165 W · 1.8 GHz base · 45 MB cache · DDR5-4000Intel Xeon Silver 4416+ — 20 cores / 40 threads · 165 W · 2 GHz base · 37.5 MB cache · DDR5-4000Intel Xeon Gold 5433N — 20 cores / 48 threads · 160 W · 2.3 GHz base · 45 MB cache · DDR5-4000Intel Xeon Gold 5423N — 20 cores / 40 threads · 145 W · 2.1 GHz base · 37.5 MB cache · DDR5-4000Intel Xeon Gold 6416H — 18 cores / 36 threads · 165 W · 2.2 GHz base · 45 MB cache · DDR5-4800Intel Xeon Gold 6444Y — 16 cores / 32 threads · 270 W · 3.6 GHz base · 45 MB cache · DDR5-4800Intel Xeon Platinum 8444H — 16 cores / 32 threads · 270 W · 2.9 GHz base · 45 MB cache · DDR5-4800Intel Xeon Gold 6426Y — 16 cores / 32 threads · 185 W · 2.5 GHz base · 37.5 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 / 20 threads · 150 W · 2.7 GHz base · 26.25 MB cache · DDR5-4000Intel Xeon Gold 6434 — 8 cores / 16 threads · 195 W · 3.7 GHz base · 22.5 MB cache · DDR5-4800Intel Xeon Gold 6434H — 8 cores / 16 threads · 195 W · 3.7 GHz base · 22.5 MB cache · DDR5-4800Intel Xeon Gold 5415+ — 8 cores / 16 threads · 150 W · 2.9 GHz base · 22.5 MB cache · DDR5-4400Intel Xeon Bronze 3408U — 8 cores / 8 threads · 125 W · 1.8 GHz base · 22.5 MB cache · DDR5-40008593Q64 cores — the top SKU8581V4.5 W/core — most efficient
5th Gen Xeon Scalable 324th Gen Xeon Scalable 52Bubble size = L3 cache · hover a bubble for the full SKU

SR650a V4: processors by cores and TDP

Lenovo ThinkSystem SR650a V4 processors0816243240485664728088100 W150 W200 W250 W300 W350 WCores per processorIntel Xeon 6 6787P — 86 cores / 172 threads · 350 W · 2 GHz base · 336 MB cache · DDR5-6400Intel Xeon 6 6781P — 80 cores / 160 threads · 350 W · 2 GHz base · 336 MB cache · DDR5-6400Intel Xeon 6 6761P — 64 cores / 128 threads · 350 W · 2.5 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 6741P — 48 cores / 96 threads · 300 W · 2.5 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 6732P — 32 cores / 64 threads · 350 W · 3.8 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6745P — 32 cores / 64 threads · 300 W · 3.1 GHz base · 336 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 6731P — 32 cores / 64 threads · 245 W · 2.5 GHz base · 144 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 6521P — 24 cores / 48 threads · 225 W · 2.6 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 6725P — 16 cores / 32 threads · 235 W · 3.7 GHz base · 192 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 6511P — 16 cores / 32 threads · 150 W · 2.3 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 · DDR5-6400Intel Xeon 6 6503P — 8 cores / 16 threads · 135 W · 2.8 GHz base · 48 MB cache · DDR5-64006 6787P86 cores · 4.1 W/core — top SKU and most efficient
Xeon 6 P-core 27Bubble size = L3 cache · hover a bubble for the full SKU

SR650 V3: 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

SR650a V4: 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

SR650 V3: drive bays

Front panel

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

SAS/SATANVMeSAS/SATA + NVMe

SR650a V4: drive bays

Front panel

8 × 2.5" NVMe at the front — 8 bays in total.

SAS/SATANVMeSAS/SATA + NVMe

SR650 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 — input 230V; max quantity 21800Platinum1800 W Titanium — AC input power - 80 PLUS Titanium efficiency; input 230V; max quantity 21800Titanium1800 W Titanium — AC input power - 80 PLUS Titanium efficiency; input 230V; max quantity 21800Titanium2400 W Platinum — 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

SR650a V4: power supplies

0500100015002000250030003500800 W Platinum — CRPS v1.5; 230V/115V; C14800Platinum800 W Titanium — CRPS Premium; 230V/115V; C14800Titanium800 W Titanium — CRPS v1.4; 230V/115V; C14800Titanium1300 W not stated — -48V DC CRPS Premium (-44V to -54V DC); BizLink connector; efficiency rating not stated in doc1300DC1300 W Platinum — CRPS v1.5; 230V/115V (1000W at 115V); C141300Platinum1300 W Platinum — CRPS v2.4; 230V/115V (1000W at 115V); C141300Platinum1300 W Platinum — HVAC/HVDC CRPS Premium; 200-277V AC / 240-380V DC; Amphenol connector1300Platinum1300 W Titanium — CRPS Premium; 230V/115V (1000W at 115V); C141300Titanium1300 W Titanium — CRPS v2.4; 230V/115V (1000W at 115V); C141300Titanium2000 W Titanium — CRPS Premium; 230V only; C142000Titanium2700 W Platinum — CRPS v2.3; 230V only; C202700Platinum2700 W Platinum — CRPS v2.4; 230V only; C202700Platinum2700 W Titanium — CRPS Premium; 230V only; C202700Titanium3200 W Titanium — CRPS Premium; 230V only; C203200TitaniumWatts · dashed line = output at 100–120 V low line
AC277 VAC / HVDC−48 V DC
07 — Questions

SR650 V3 vs SR650a V4, answered

Is the SR650 V3 or the SR650a V4 the faster server?

Neither document publishes benchmark results, so this page compares what they do state. The SR650 V3 lists 84 processors up to 64 cores at 385 W; the SR650a V4 lists 27 up to 86 cores at 350 W. Fully populated that is 128 cores against 172.

Which holds more memory?

The SR650 V3 has 32 DIMM slots and a stated ceiling of 8 TB. The SR650a V4 has 32 and 8 TB.

Which takes more drives?

SR650 V3: 40 bays across 20 documented layouts. SR650a V4: 8 across 4. Counts include rear and mid-chassis positions where the vendor documents them.

Can either take GPUs?

SR650 V3: up to 8 accelerators, 1 double-wide cards listed. SR650a V4: up to 8, 4 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. SR650 V3: Lenovo ThinkSystem SR650 V3 Server Product Guide (publication date is not printed in the text export) (Lenovo document). SR650a V4: Lenovo ThinkSystem SR650a V4 and SR650i V4 Servers (August 27, 2026) (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.

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