Original 2U Rack Server Lenovo thinksystem SR655 Rack server Thinksystem SR645 V3 Rack server 4th Generation AMD EPYC Cloud Storage Server
Here’s a detailed comparison table between the Lenovo ThinkSystem SR655 and ThinkSystem SR645 V3 rack servers:
| Feature | ThinkSystem SR655 | ThinkSystem SR645 V3 |
|---|---|---|
| Form Factor | 2U Rack Server | 2U Rack Server |
| Processor Support | Dual AMD EPYC 7002/7003 Series | Dual AMD EPYC 9004 Series (Genoa) |
| Max CPU Cores | Up to 64 cores per socket | Up to 96 cores per socket |
| Memory Capacity | Up to 4TB DDR4 (32 DIMMs) | Up to 6TB DDR5 (48 DIMMs) |
| Storage Options | 24x 2.5″ or 12x 3.5″ bays | 24x 2.5″ or 12x 3.5″ bays |
| PCIe Generation | PCIe 4.0 | PCIe 5.0 |
| PCIe Slots | Up to 8 slots | Up to 10 slots |
| GPU Support | Up to 3x GPUs | Up to 4x GPUs |
| Network Options | 2x 1GbE (upgradable to 100GbE) | 2x 1GbE (upgradable to 200GbE) |
| Power Supplies | Dual 800W/1600W (hot-swap) | Dual 800W/2000W (hot-swap) |
| Use Cases | Virtualization, HPC, databases | AI/ML, cloud-native apps, databases |
| Ideal For | General-purpose workloads | Next-gen demanding workloads |
1. Lenovo ThinkSystem SR655 – High-Performance 2U Workhorse
The ThinkSystem SR655 is a 2U dual-socket rack server powered by AMD EPYC 7002/7003 processors, delivering exceptional performance for a wide range of enterprise workloads. This server strikes an excellent balance between performance, density, and cost-efficiency.
Key Features:
- AMD EPYC Power: Supports dual 7002/7003 series CPUs (up to 64 cores per socket)
- Massive Memory: 4TB DDR4 capacity across 32 DIMM slots
- Flexible Storage: Configurable with 24x 2.5″ or 12x 3.5″ drives
- PCIe 4.0 Expansion: 8 slots for accelerators and adapters
- GPU Ready: Supports up to 3 GPUs for accelerated workloads
- Enterprise Networking: Options for up to 100GbE connectivity
- Reliable Power: 800W/1600W redundant PSUs
Best For: General virtualization, databases, HPC, and software-defined storage.
2. Lenovo ThinkSystem SR645 V3 – Next-Gen 2U Performance
The ThinkSystem SR645 V3 represents the next evolution of Lenovo’s AMD-powered servers, featuring 4th Gen EPYC 9004 (Genoa) processors with PCIe 5.0 support for cutting-edge workloads.
Key Features:
- 4th Gen AMD EPYC: Dual 9004 series CPUs (up to 96 cores per socket)
- DDR5 Memory: 6TB capacity across 48 DIMM slots
- PCIe 5.0 Future-Proofing: 10 slots with double the bandwidth of PCIe 4.0
- Enhanced GPU Support: Accommodates up to 4 GPUs
- High-Speed Networking: 200GbE-ready for demanding applications
- Advanced Cooling: Optimized for high-density deployments
- Higher Power Options: 2000W PSUs available
Best For: AI/ML workloads, cloud-native applications, high-performance databases, and future-proof infrastructure.
Key Differences Summary
| Aspect | SR655 | SR645 V3 |
|---|---|---|
| CPU Generation | EPYC 7002/7003 | EPYC 9004 (Genoa) |
| Memory Tech | DDR4 | DDR5 |
| PCIe Version | 4.0 | 5.0 |
| Max Cores | 64/socket | 96/socket |
| GPU Capacity | 3 | 4 |
| Network Speed | Up to 100GbE | Up to 200GbE |
Which Server Should You Choose?
- For Current Workloads & Budget-Conscious Deployments → SR655
- For Future-Proof Infrastructure & Cutting-Edge Workloads → SR645 V3
