Rack server Lenovo ThinkSystem SR650 v2 / SR665 with x16 PCIe Gen4 expansion slots

The Lenovo ThinkSystem SR650 v2 / SR665 rack server provides enterprise-class expansion capability with x16 PCIe Gen4 slots designed to accommodate high-throughput add-in cards. Built for data center environments, this platform supports a range of accelerators, networking adapters and storage controllers to scale compute and I/O bandwidth. The server family targets virtualization, database and mixed enterprise workloads that require low-latency, high-bandwidth PCIe Gen4 connectivity and flexible configuration options.

Advantages

The SR650 v2 / SR665 delivers PCIe Gen4 x16 expansion slots that enable increased I/O throughput and improved performance for modern accelerators and NVMe storage. Its rack-optimized design supports dense deployment and serviceability in data center racks. The platform’s flexibility allows integration of multiple accelerator cards, high-speed networking and storage controllers without compromising system cooling or reliability. These characteristics help maintain consistent performance under sustained enterprise workloads.

Suitable for

• Virtualization platforms and VDI infrastructures
• Relational and distributed database systems
• AI/ML inference and training acceleration with add-in accelerators
• High-performance networking and software-defined networking (SDN)
• Storage acceleration with NVMe controllers and caching cards

Key specifications

• PCIe generation: Gen4 x16 expansion slots for add-in cards
• Form factor: 2U rack server optimized for data center deployment
• Expansion capability: multiple full-height, full-length slot support for accelerators and adapters
• Cooling and serviceability: engineered for sufficient airflow with hot-swap components and tool-less access
• Use case focus: high-bandwidth I/O, accelerator support, scalable storage and networking

How to use

Install the server in a standard 19-inch rack and connect to appropriate power and network infrastructure following your data center practices. Populate the x16 PCIe Gen4 slots with compatible add-in cards such as GPUs, FPGAs, NVMe controllers or 25/40/100 Gb network adapters, ensuring cards meet the server’s physical and thermal requirements. Configure server firmware and operating system drivers to recognize installed devices and allocate resources for virtualization, database or accelerator workloads. Monitor system health and thermal parameters to maintain stable operation under load.

Usage recommendations

Choose add-in cards certified for PCIe Gen4 and validated for the Lenovo ThinkSystem SR650 v2 / SR665 platform where possible. Plan slot population and cooling budgets before deployment, and update firmware and drivers to the latest vendor-supported versions to ensure compatibility and optimal performance.