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Report: SpaceX is building its own 'Kessel' rack with 72 Nvidia Rubin GPUs, partly for data centers in space

According to SemiAnalysis, as reported by Tom's Hardware, SpaceX/xAI is developing its own version of Nvidia's Vera Rubin NVL72 system, codenamed Kessel, that replaces NVLink cable assemblies with an 84-layer printed circuit board. Uses include orbital data centers.

Report: SpaceX is building its own 'Kessel' rack with 72 Nvidia Rubin GPUs, partly for data centers in space
Image: Tom's Hardware (opens the source site in a new tab)

According to the report, Kessel keeps the basic Vera Rubin NVL72 configuration: 36 Vera CPUs, 72 Rubin GPUs and nine NVLink switch trays. Instead of Nvidia's cable cartridges, compute and switch trays sit back-to-back around a passive PCB midplane. Tom's Hardware says the layout resembles a smaller version of Nvidia's Kyber design, which also relies on a PCB interconnect.

SpaceX/xAI will keep buying Nvidia hardware directly but will source other components itself, which could give it more control over its supply chain. This is a research firm's report; SpaceX and Nvidia have not confirmed the details, and no timeline has been given for deployment on the ground or in orbit.

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