Lenovo 7XG7A03955 ThinkSystem SR950 2-CPU 24 DIMM Compute System Board

Overview

The Lenovo 7XG7A03955 is a compute system board designed for the ThinkSystem SR950 server platform, supporting a 2-CPU configuration with 24 DIMM slots. This board targets scenarios where an SR950 system board requires replacement — whether due to component failure, a planned platform upgrade, or expanding compute capacity within an existing SR950 chassis. At 4.00 lb, it ships factory-new and is sourced from Mexico manufacturing. If you are maintaining or refreshing an SR950 deployment, the 7XG7A03955 is the board to source for the dual-processor, 24-DIMM topology.

Compatibility

This board is designed specifically for the Lenovo ThinkSystem SR950 enterprise server chassis in a 2-CPU compute board configuration. The SR950 supports up to four compute boards; this variant handles 2 processors and 24 DIMMs per board. Confirm your SR950 chassis generation and existing board topology before ordering — the SR950 line supports multiple compute board configurations, and mixing incompatible board revisions will prevent the system from posting. Consult the SR950 Hardware Maintenance Manual to verify the correct board slot assignment and any firmware prerequisites before installation.

Installation Notes

System board replacement on the SR950 requires full chassis power-down and proper ESD precautions — this is not a hot-swap component. The SR950's multi-board architecture means processor and DIMM population rules apply per-board; re-seat or migrate existing DIMMs according to Lenovo's population guidelines for the 24-DIMM layout to avoid memory training failures at POST. Verify server infrastructure firmware compatibility and update the XCC and UEFI to current levels before installing the replacement board to reduce the risk of hardware incompatibility errors.