Best Selling Lenovo Thinksystem SR645 Rack server Thinksystem SR665 Rack server Processor CPU SSD 1TB With Memory Cards in Stock
Here’s a detailed comparison table between the Lenovo ThinkSystem SR645 and ThinkSystem SR665 rack servers, highlighting their key differences in performance, scalability, and use cases:
Lenovo ThinkSystem SR645 vs. SR665 – Rack Server Comparison
| Feature | ThinkSystem SR645 (1U) | ThinkSystem SR665 (2U) | Key Difference |
|---|---|---|---|
| Form Factor | 1U Rack Server | 2U Rack Server | SR645 is more compact, SR665 offers better expandability |
| Processor | 1x or 2x AMD EPYC 7003/9004 (Gen 3/4) | 1x or 2x AMD EPYC 7003/9004 (Gen 3/4) | Same CPU options |
| Max Cores | Up to 128 cores (2x 64-core EPYC) | Up to 128 cores (2x 64-core EPYC) | Identical CPU support |
| Memory Capacity | Up to 4TB DDR4/DDR5 (16 DIMMs) | Up to 6TB DDR4/DDR5 (32 DIMMs) | SR665 supports double the memory |
| Storage Options | – Up to 10x 2.5″ or 4x 3.5″ drives – 2x M.2 (boot) |
– Up to 24x 2.5″ or 12x 3.5″ drives – 4x M.2 (boot) |
SR665 has 3x more drive bays |
| PCIe Expansion | 5x PCIe 4.0 slots (3x FHHL, 2x LP) | 7x PCIe 4.0 slots (6x FHHL, 1x LP) | SR665 has more PCIe slots |
| GPU Support | Up to 2x single-width GPUs (e.g., NVIDIA T4) | Up to 4x double-width GPUs (e.g., NVIDIA A100) | SR665 better for AI/ML workloads |
| Networking | OCP 3.0 (up to 2x 100GbE) | OCP 3.0 (up to 2x 100GbE) + additional PCIe NICs | Similar networking, but SR665 has more slots for NICs |
| RAID Support | HW RAID (ThinkSystem RAID 930-8i) | HW RAID (ThinkSystem RAID 930-16i/940-16i) | SR665 supports higher-end RAID |
| Power Supply | 550W/800W/1400W (Platinum) | 750W/1100W/2000W (Platinum/Titanium) | SR665 supports higher wattage PSUs |
| Cooling | Optimized for 1U density | Enhanced cooling for GPUs & high TDP CPUs | SR665 better for high-power workloads |
| Use Cases | – Virtualization – Cloud hosting – Light AI workloads |
– AI/ML & HPC – Database servers – High-density storage |
SR645 for density, SR665 for performance |
Lenovo ThinkSystem SR645 & SR665 Rack Servers – Overview
ThinkSystem SR645 (1U) – High-Density, Power-Efficient Server
The Lenovo ThinkSystem SR645 is a 1U dual-socket rack server designed for high-density virtualization, cloud, and enterprise workloads. Powered by AMD EPYC 7003/9004 Series processors, it delivers exceptional performance in a compact form factor, making it ideal for space-constrained data centers, edge computing, and cost-sensitive deployments.
Key Features:
✔ Dual AMD EPYC CPUs – Up to 128 cores (2x 64-core) for high thread density.
✔ Up to 4TB DDR4/DDR5 RAM – 16 DIMM slots for memory-intensive workloads.
✔ Flexible Storage – Supports 10x 2.5″ or 4x 3.5″ drives + 2x M.2 for boot.
✔ GPU Acceleration – Fits 2x single-width GPUs (NVIDIA T4, A2) for AI inference.
✔ PCIe 4.0 Expansion – 5x slots for NICs, NVMe, or accelerators.
✔ Power Efficiency – 80+ Platinum PSUs with optimized cooling.
Best For:
✅ Virtualization (VMware, Hyper-V, Kubernetes)
✅ Cloud & Edge Computing
✅ Light AI/ML & Database Workloads
ThinkSystem SR665 (2U) – High-Performance, Scalable Server
The Lenovo ThinkSystem SR665 is a 2U dual-socket rack server built for AI, HPC, and large-scale storage. With support for up to 4x double-width GPUs and 6TB of memory, it excels in machine learning, data analytics, and mission-critical applications.
Key Features:
✔ Dual AMD EPYC CPUs – Up to 128 cores (2x 64-core) for extreme multi-threading.
✔ Up to 6TB DDR4/DDR5 RAM – 32 DIMM slots for massive memory bandwidth.
✔ Massive Storage – 24x 2.5″ or 12x 3.5″ drives + 4x M.2 for boot.
✔ Elite GPU Support – 4x double-width GPUs (NVIDIA A100, H100, AMD Instinct).
✔ PCIe 4.0 Expansion – 7x slots for high-speed networking & accelerators.
✔ Mission-Critical Reliability – Redundant PSUs, advanced cooling.
Best For:
✅ AI/ML Training & Deep Learning
✅ High-Performance Computing (HPC)
✅ Enterprise Databases (SAP HANA, Oracle, SQL Server)
✅ Large-Scale Storage & Virtualization
Comparison Summary
| Aspect | SR645 (1U) | SR665 (2U) |
|---|---|---|
| Form Factor | 1U (Dense) | 2U (Expandable) |
| CPU | 2x AMD EPYC | 2x AMD EPYC |
| Max Memory | 4TB (16 DIMMs) | 6TB (32 DIMMs) |
| Storage Bays | 10x 2.5″ | 24x 2.5″ |
| GPU Support | 2x Single-Width | 4x Double-Width |
| PCIe Slots | 5x PCIe 4.0 | 7x PCIe 4.0 |
| Best Use Case | Cloud, Edge, Light AI | AI, HPC, Big Data |
Which One to Choose?
- For space-saving and cost efficiency → SR645 (1U)
- For AI, HPC, and large storage → SR665 (2U)
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