What is the maximum memory of the Lenovo ThinkSystem SR655 V3?
3 TB, using twelve 256 GB 3DS RDIMMs — one in each of the processor’s 12 memory channels. That DIMM is listed only for 5th Gen EPYC; the largest 4th Gen option is 128 GB, so a 4th Gen server reaches 1.5 TB. There are no second-DIMM-per-channel slots to add later.
Which processors does the SR655 V3 support?
Lenovo lists 45 single AMD EPYC processors: 25 from the 5th Gen 9005 family and 20 from the 4th Gen 9004 family, ranging from 8-core to 160-core parts rated 125–400 W. The largest is the 160-core EPYC 9845 at 390 W; the fastest-clocked base part is the 16-core 9175F at 4.2 GHz.
How many drives can the SR655 V3 hold?
Across its three zones the ceiling is 40 × 2.5-inch drives (front 24, middle 8, rear 8) or 20 × 3.5-inch drives (front 12, middle 4, rear 4). Boot drives come on top: two rear 7mm bays and an internal M.2 module. Up to 32 of the 2.5-inch drives can be NVMe using switch adapters, or 24 with no lane oversubscription.
How many GPUs does the SR655 V3 support?
Up to eight single-wide NVIDIA L4 cards, or three double-wide GPUs seated in slots 2, 5 and 7. Lenovo lists the L4, L40S, L40, A16, A30, RTX 4500 Ada, RTX PRO 4500 Blackwell and RTX PRO 6000 Blackwell Max-Q. GPU builds need a processor of 300 W or less and cannot use mid or rear drive bays.
Does having one processor limit PCIe expansion?
Lenovo gives each supported EPYC 128 PCIe 5.0 lanes, 64 of them available for PCIe and NVMe devices, and the server still offers up to 10 PCIe slots plus OCP 3.0 — up to nine at PCIe 5.0. The real trade-offs are between slots and drives: Riser 3 excludes rear drives, and front slots replace Riser 3 and 4.
How does the SR655 V3 differ from the SR665 V3 and SR635 V3?
The SR665 V3 uses the same 2U drive design (20 × 3.5-inch or 40 × 2.5-inch) but takes one or two processors, 24 DIMMs (6 TB) and up to 12 PCIe slots. The SR635 V3 is the 1U single-socket model: 12 DIMMs and 3 TB like the SR655 V3, but up to 12 × 2.5-inch bays, no 3.5-inch bays, five PCIe slots and four single-width GPUs of up to 75 W.
What power supplies are available for the SR655 V3?
Ten hot-swap options: 750, 1100, 1800 and 2600 W Titanium, 750, 1100, 1800 and 2400 W Platinum, and one DC choice rated 1100 W at −48 V. Just two of them, the 750 W and 1100 W Platinum units, accept 110 V. A server holds two supplies at most, and a pair must be identical.
How big and heavy is the SR655 V3?
Lenovo gives 445 × 87 × 766 mm (W × H × D) — 482 mm wide at the EIA flanges — and a maximum weight of 38.8 kg. Lenovo’s enhanced slide rails apply when a server of 34 kg or more ships installed in a rack, such as a build with 20 × 3.5-inch HDDs.
What changed from the original SR655 to the SR655 V3?
Processor support jumps two EPYC generations, from 2nd/3rd Gen to 4th/5th Gen, and the core ceiling rises from 64 to 160; from DDR4-2933 with 16 DIMMs to DDR5-6400 with 12 DIMMs on 12 channels, and from 2 TB to 3 TB. PCIe moves to 5.0 at 64 lanes, 2.5-inch bays rise from 32 to 40, the OCP slot can be at the front, and XClarity Controller 2 replaces the AST2500-based controller.
Is the Lenovo ThinkSystem SR655 V3 end of life?
No end-of-service date appears in Lenovo’s product guide, which still lists current processors and options, including changes marked as new in July 2026. An individual machine is covered for as long as its warranty or Lenovo service agreement runs, and if Lenovo announces withdrawal or support-end dates, our end-of-life checker will list them.
