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Lenovo ThinkSystem SR635

End of saleServers1U rack
Lenovo ThinkSystem SR6351U rack16 × SFF 2.5" bays

The Lenovo ThinkSystem SR635 is a single-socket 1U rack server engineered around AMD EPYC 7002 and 7003 Series processors. Providing up to 64 cores and 128 PCIe 4.0 lanes from a single CPU, it lowers hypervisor per-socket software licensing costs while providing high memory and storage bandwidth for virtualization and database deployments.

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Specifications

BrandLenovo
FamilyThinkSystem SR
Form factor1U rack
ReleasedAug 2019
End of saleJun 2023
End of supportJun 2028
ProcessorSingle AMD EPYC 7002 or 7003 series processor up to 64 cores (up to 280W TDP)
Memory16x DDR4 DIMM slots supporting up to 2TB DDR4-3200 ECC RDIMM/3DS RDIMM
Drive baysUp to 16x 2.5-inch or 4x 3.5-inch drive bays; supports up to 16 direct-connect NVMe SSDs
Expansion slotsUp to 3x PCIe 4.0 slots plus 1x OCP 2.0 mezzanine slot
NetworkOCP 2.0 slot supporting dual or quad 1GbE/10GbE/25GbE adapters
Power supplyDual redundant hot-swap 550W, 750W, 1100W Platinum PSUs
ManagementLenovo XClarity Controller (XCC)

Generations

Compatible parts

Hard drives

Works together

How the Lenovo ThinkSystem SR635 connects to servers, storage and the network: 4 ways, with the parts and products on each path.

Fibre Channel SANiSCSI and NVMe/TCP over EthernetDirect-attached SASFile storage (NFS and SMB)

Fibre Channel SAN

Match the speed: 16Gb and 32Gb FC HBAs, switches and array ports work together, and each generation also runs one or two speeds below its own (a 32Gb port runs at 16Gb and 8Gb).

Adapters for the server (check the fit list)

Switches

Storage

Optics

Fibre Channel SAN: how it fits together

iSCSI and NVMe/TCP over Ethernet

Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.

Adapters for the server (check the fit list)

Switches

Storage

Optics

iSCSI and NVMe/TCP over Ethernet: how it fits together

Direct-attached SAS

12Gb SAS uses Mini-SAS HD (SFF-8644) connectors; older 6Gb gear uses Mini-SAS (SFF-8088). Adapter cables exist, but the link runs at the slower speed.

Adapters for the server (check the fit list)

Storage

Direct-attached SAS: how it fits together

File storage (NFS and SMB)

Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.

Adapters for the server (check the fit list)

Switches

Storage

Optics

File storage (NFS and SMB): how it fits together

Plan and size it

Check compatibility with Lenovo

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Lenovo has tested with the Lenovo ThinkSystem SR635.

Equivalent models from other brands

FAQ

How many NVMe drives can be directly attached without PCIe switches on SR635?

Due to the 128 PCIe 4.0 lanes provided by the single AMD EPYC CPU, up to 16 NVMe SSDs connect directly to CPU lanes.

Does the SR635 support dual processors?

No, the SR635 is designed strictly as a high-density single-socket system.

Buying or selling ThinkSystem SR635?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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Sources