The Lenovo ThinkSystem SR630 (1U) and SR650 (2U) are the workhorses of Lenovo’s data center lineup. This guide compares their specifications to help you choose the right form factor.
Key Differences
| Feature | SR630 (1U) | SR650 (2U) |
|---|---|---|
| Form Factor | 1U Rack | 2U Rack |
| Drive Bays | Up to 10 SFF | Up to 24 SFF or 14 LFF |
| Max Memory | 1.5TB DDR4 | 1.5TB DDR4 |
| CPU Sockets | 2 | 2 |
| GPU Support | Limited (1 GPU) | Up to 3 GPUs |
| PCIe Slots | 3 | 6 |
When to Choose SR630 (1U)
- Density matters — fit more servers per rack
- Compute-focused workloads (VMs, containers)
- Lower power and cooling costs
When to Choose SR650 (2U)
- Storage-heavy workloads (14-24 drives)
- GPU computing (AI/ML, VDI)
- More PCIe expansion needed
Browse compatible parts: SR630 | SR650 | All Lenovo upgrade guides