Lenovo ThinkSystem SR650a V4 Workstation — Full Technical Specifications

Work down this sheet from the bottom, where the certification note sits — that note is why this page exists, and it governs which cards and which software releases are validated on the platform. Above it, the card positions at the front of the chassis are what make several professional accelerators practical in a rack rather than under a desk, and the reduced bay count is the price of that layout. Check the certified card list against what your applications require before choosing anything else on the sheet, because on a certified build the card decision comes first and the rest of the configuration follows it. Local storage is deliberately modest; plan for a fabric or a nearby array.