Lenovo ThinkSystem SR635 V3

Lenovo's 1-socket 1U rack server (machine types 7D9G/7D9H) for 4th and 5th Gen AMD EPYC processors up to 160 cores and 400 W, with 12 DDR5 DIMM slots (up to 3 TB), up to 12 x 2.5" or 16 x E1.S EDSFF drives, up to 5 PCIe slots plus a dedicated OCP 3.0 slot, and up to 5 single-wide GPUs. A dense, high-core-count general-purpose server for virtualization, cloud and HPC.

Memory

Slots: 12 DIMM (1 DIMM per channel, 12 channels)
Max: 3 TB (12 x 256 GB 3DS RDIMM)
Types: Lenovo TruDDR5 RDIMM, 3DS RDIMM, 9x4 RDIMM, 10x4 RDIMM; no UDIMM or LRDIMM. DIMM type, x4/x8 width and DRAM technology (16/24/32 Gb) cannot be mixed; only two DIMM capacities per system, larger DIMMs installed first
Speed: 6400 MT/s or 6000 MT/s with 5th Gen EPYC 9005 (DIMM-dependent); 4800 MT/s with 4th Gen EPYC 9004; runs at the lower of the CPU's memory bus speed or the DIMM's rated speed
Population: 1, 2, 4, 6, 8, 10 or 12 DIMMs; other quantities not supported
Protection: ECC, Bounded Fault, SDDC (x4 DIMMs only), Patrol/Demand Scrubbing, DRAM Address Command Parity with Replay, DRAM Uncorrected ECC Error Retry, On-die ECC, ECC Error Check and Scrub (ECS), Post Package Repair; memory mirroring and rank sparing not supported
Persistent memory: Not supported

Storage

Front 2.5": 4 x hot-swap SAS/SATA or NVMe, 8 x hot-swap SAS/SATA, or 10 x hot-swap SAS/SATA, AnyBay or NVMe (combinations)
Rear 2.5": 2 x hot-swap SAS/SATA, 2 x hot-swap NVMe, 2 x 7mm hot-swap SATA, or 2 x 7mm hot-swap NVMe
EDSFF: Up to 16 x E1.S hot-swap NVMe (front)
M.2: Internal module for up to 2 M.2 NVMe/SATA drives (OS boot); RAID via RAID 540-8i in Tri-Mode
Onboard: Onboard NVMe (no RAID), 16 drives each x4; onboard SATA (no RAID), 12 drives
RAID / HBA: RAID 540-8i/540-16i PCIe Gen4 12 Gb (0/1/10); RAID 940-8i/940-16i PCIe Gen4 12 Gb with up to 8 GB flash cache and Tri-Mode NVMe support (0/1/5/6/10/50/60); RAID 4350/5350/9350 8i/16i; non-RAID 12 Gb SAS/SATA HBA 8-port/16-port; CFF (cabled) form factor available so RAID/HBA doesn't consume a PCIe slot
Max NVMe: 12 x 2.5" NVMe, all with direct (non-oversubscribed) connections
Max capacity: 737.28 TB (12 x 61.44 TB 2.5" NVMe SSD); 368.64 TB (12 x 30.72 TB SAS SSD); 122.88 TB (16 x 7.68 TB E1.S NVMe)
Optical / tape: No internal optical or tape drive bays

Graphics

Onboard: Embedded 2D graphics in XClarity Controller 2, 16 MB, max 1920x1200 32bpp at 60 Hz
GPU support: Up to 5 x single-wide 75 W GPUs (e.g. NVIDIA L4); specific riser/slot combinations support 1-2 GPUs depending on configuration; Controlled (export-restricted) GPUs require a "for AI" base CTO model

Expansion

Rear slots: Up to 3 x PCIe x16 low-profile (mixed Gen4/Gen5), or 1 x PCIe x16 full-height half-length + 1 x PCIe x16 low-profile, or 1-2 x PCIe x16 low-profile combined with rear 2.5"/7mm drive bays; slot availability depends on riser selection
Front slots: 2 x PCIe x16 (1 full-height half-length + 1 low-profile), or the front OCP slot; front and rear OCP slots are mutually exclusive
OCP 3.0: 1 x dedicated OCP 3.0 SFF slot, PCIe 5.0 x16, rear- or front-accessible; one port can be shared with XCC2 for Wake-on-LAN/NC-SI
CFF: Dedicated cabled (CFF) bay for a RAID/HBA adapter that does not use a PCIe slot (2.5" front configurations only)

Networking

OCP 3.0 adapters: Broadcom 5719 4x1GbE, Intel I350 4x1GbE, Broadcom 57412 4x10GBASE-T, Broadcom 57416 2x10GBASE-T, Intel X710-T2L 2-port / X710-T4L 4-port 10GBASE-T, Broadcom 57414 2x10/25GbE SFP28, Broadcom 57504 4x10/25GbE SFP28, Intel E810-DA2 2-port / E810-DA4 4-port 10/25GbE SFP28, Mellanox ConnectX-6 Lx 2x10/25GbE
Management: 1 x dedicated 1GbE RJ-45 XCC2 port; optional 2nd XCC2 port installs in the OCP slot

Power

PSU options: 750 W, 1100 W and 1800 W AC (80 PLUS Platinum or Titanium, 220 V AC; 750 W and 1100 W also support 110 V); 1100 W -48 V DC; 240 V DC support in China only
Redundancy: Up to 2 hot-swap redundant PSUs; one fan integrated in each PSU
Input voltage: 100-127 V AC or 200-240 V AC, 50/60 Hz; 180-300 V DC (China only); -48 to -60 V DC (DC PSU)
Cooling: Up to 7 x N+1 redundant hot-swap 40 mm fans (configuration dependent); optional closed-loop liquid-cooled heatsink (Neptune Liquid to Air Module) or Neptune Core open-loop water cooling for high-TDP CPUs

Ports

Front: 1 x USB 3.1 Gen 1 (5 Gb/s), 1 x USB 2.0 (XCC local management), external diagnostics port, optional VGA
Rear: 3 x USB 3.1 Gen 1 (5 Gb/s), 1 x VGA, 1 x RJ-45 1 GbE XCC2 management port; optional 2nd XCC2 port (OCP slot); optional DB-9 serial port (slot 3)
Internal: 1 x USB 3.1 Gen 1 for OS/license key purposes

Physical

Form factor: 1U rack
Dimensions: 440 mm W x 43 mm H x 773 mm D (17.3 x 1.7 x 30.4 in), excluding EIA flanges, bezel and PSU handles
Detailed depth: 724 mm to rearmost I/O port; 754 mm to PSU handle (<=1100 W PSU) or 782 mm (1800 W PSU)
Weight: 20.2 kg (44.6 lb) maximum
Machine types: 7D9G (3-year warranty), 7D9H (1-year warranty)
Environment: ASHRAE A2 (most configs); A3/A4/H1 depending on configuration; ambient limited to 30-45 degC depending on TDP, DIMMs, drives, NICs and cooling installed

Management

BMC: XClarity Controller 2 (XCC2, ASPEED AST2600); optional XCC Platinum adds remote control features
Local: Operator panel with status LEDs; optional External Diagnostics Handset with LCD; optional Integrated Diagnostics Panel (8 x 2.5" front bay models)
Tools: XClarity One, XClarity Integrator plugins, XClarity Energy Manager
Security: Chassis intrusion switch, power-on and administrator passwords, Root of Trust module with TPM 2.0 and Platform Firmware Resiliency (PFR); optional Nationz TPM 2.0 (China); optional lockable front security bezel
Warranty: 3-year (7D9G) or 1-year (7D9H) customer-replaceable-unit and onsite limited warranty, 9x5 next business day; optional service upgrades

Operating systems

Windows: Windows Server; Windows 10 and 11 (subset of adapters/drives; dedicated Workstation base CTO models 7D9GCTO2WW / 7D9HCTO2WW)
Red Hat (5th Gen CPU): RHEL 8.10, 9.4-9.8, 10.0-10.2
Red Hat (4th Gen CPU): RHEL 8.6-8.10, 9.0-9.8, 10.0-10.2
SUSE: SLES 15 SP4-SP7 (SP6-SP7 with 5th Gen), SLES 15 Xen SP4/SP5, SLES 16
Ubuntu: 20.04 LTS (4th Gen only), 22.04 LTS, 24.04 LTS, 26.04 LTS
VMware: ESXi 7.0 U3, 8.0, 8.0 U1, 8.0 U2, 8.0 U3, 9.0, 9.1 (5th Gen CPU: 8.0 U3, 9.0, 9.1 only)

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