Lenovo ThinkSystem SR655 V3

1-socket 2U rack server built on 5th Gen AMD EPYC 9005 ("Turin") or 4th Gen AMD EPYC 9004 ("Genoa") processors, with up to 40x 2.5-inch or 20x 3.5-inch drive bays and support for up to eight single-wide or three double-wide GPUs, aimed at dense, GPU-capable workloads that don't need a second socket.

Memory

Slots: 12 DIMM (12 memory channels per processor, 1 DPC)
Type: Lenovo TruDDR5 RDIMM, 3DS RDIMM and 9x4 RDIMM, up to 6400 MT/s (5th Gen only) / lower on 4th Gen
Max: 3 TB with 12 x 256 GB 3DS RDIMM
RAS: ECC, SDDC (Chipkill), Patrol/Demand Scrubbing, Bounded Fault, DRAM Address/Command Parity with Replay, DRAM Uncorrected ECC Error Retry, On-die ECC, ECS, Post Package Repair

Storage

Bays: Up to 20 x 3.5" or 40 x 2.5" hot-swap bays: front 8/12 (3.5") or 8/16/24 (2.5"); middle 4 (3.5") or 8 (2.5"); rear 2/4 (3.5") or 4/8 (2.5"); SAS/SATA, NVMe or AnyBay combinations
Other boot/storage: 2x rear 7mm hot-swap drives; internal M.2 module for up to 2x M.2 drives, optional RAID
Max capacity: 2.5": 1228.8 TB (40x 30.72 TB SAS SSD), 3,932.16 TB (32x 122.88 TB NVMe SSD). 3.5": 480 TB (20x 24 TB SAS/SATA HDD)
Controllers: Up to 16x onboard SATA ports and 12x onboard NVMe ports (non-RAID); NVMe Retimer (PCIe 4.0/5.0) and Switch (PCIe 4.0) adapters; 12 Gb SAS/SATA RAID adapters (8/16/32 port, up to 8 GB flash-backed cache, PCIe 3.0/4.0); 12 Gb SAS/SATA HBAs (8/16 port, non-RAID)

Graphics

GPU support: Up to 8x single-wide GPU or 3x double-wide GPU, configuration dependent
Supported GPUs: NVIDIA L4, A2 (single-wide, passive); NVIDIA H100 NVL 94 GB, H100 80 GB, L40S 48 GB (double-wide, passive, up to 3 controlled/export-restricted parts)
Video: AST2600 BMC-integrated, 16 MB, 2D hardware accelerator, max 1920x1200 32bpp @ 60Hz

Expansion

Slots: Up to 10x PCIe slots (10 rear via Risers 1-4, or 6 rear + 2 front) plus 1x dedicated OCP 3.0 SFF slot, PCIe 5.0 or 4.0 depending on riser/drive config

Networking

OCP slot: PCIe 4.0 x16 host interface, front- or rear-accessible; 2-port/4-port 1/10/25 GbE adapters; one port shareable with XCC2 for Wake-on-LAN/NC-SI
Management: 1x RJ-45 1 GbE dedicated XCC2 port; optional 2nd XCC2 port installs in the OCP slot

Power

Supplies: Up to 2x hot-swap redundant AC PSUs, 80 PLUS Platinum or Titanium, 750 W / 1100 W / 1800 W / 2400 W / 2600 W, 220 V AC (750 W/1100 W also 110 V); optional 1100 W -48V DC; China also supports 240 V DC

Ports

Front: 1x USB 3.2 Gen 1 (5 Gb/s), 1x USB 2.0 (also XCC local management), external diagnostics port, optional VGA
Rear: 3x USB 3.2 Gen 1 (5 Gb/s), 1x VGA, 1x RJ-45 1 GbE XCC management; optional 2nd XCC port (OCP slot); optional DB-9 serial (installs in slot 3)
Internal: 1x USB 3.2 Gen 1 connector for OS/license key media

Physical

Dimensions: 445 x 87 x 766 mm (17.5 x 3.4 x 30.1 in)
Weight: Maximum 38.8 kg (85.5 lb)

Management

Controller: XClarity Controller 2 (XCC2), ASPEED AST2600 BMC; optional XCC Platinum for remote control and other features
Platform: XClarity One, XClarity Integrator plugins, XClarity Energy Manager; operator panel with status LEDs; optional External Diagnostics Handset with LCD; optional Integrated Diagnostics Panel on 16x 2.5" front-bay models
Security: Chassis intrusion switch, power-on/administrator passwords, Root of Trust module (TPM 2.0 + Platform Firmware Resiliency); optional Nationz TPM 2.0 (China); optional lockable front security bezel

Operating systems

Certified: Microsoft Windows Server, Microsoft Windows 10 & 11, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi, Canonical Ubuntu Server

Processors

AMD EPYC 9015
AMD EPYC 9115
AMD EPYC 9135
AMD EPYC 9175F
AMD EPYC 9255
AMD EPYC 9275F
AMD EPYC 9335
AMD EPYC 9355
AMD EPYC 9355P
AMD EPYC 9365
AMD EPYC 9375F
AMD EPYC 9455
AMD EPYC 9455P
AMD EPYC 9475F
AMD EPYC 9535
AMD EPYC 9555
AMD EPYC 9555P
AMD EPYC 9565
AMD EPYC 9575F
AMD EPYC 9655
AMD EPYC 9655P
AMD EPYC 9645
AMD EPYC 9745
AMD EPYC 9825
AMD EPYC 9845
AMD EPYC 9124
AMD EPYC 9174F
AMD EPYC 9224
AMD EPYC 9254
AMD EPYC 9274F
AMD EPYC 9334
AMD EPYC 9354
AMD EPYC 9354P
AMD EPYC 9374F
AMD EPYC 9454
AMD EPYC 9454P
AMD EPYC 9474F
AMD EPYC 9534
AMD EPYC 9554
AMD EPYC 9554P
AMD EPYC 9634
AMD EPYC 9654
AMD EPYC 9654P
AMD EPYC 9734
AMD EPYC 9754