GB200 and GB300

The two Nvidia rack designs inside SpaceX’s Colossus 2: what they are, how they differ and what they cost to rent.

What they are

Superchip1 Grace CPU+ 2 Blackwell GPUs

×2

Compute tray2 superchips4 GPUs, 2 CPUs

×18

NVL72 rack18 trays72 GPUs, 36 CPUs

NVLink 5 at 130 TB/s: all 72 GPUs act as one big GPU

GB200B200 GPUs (Blackwell)Cloud availability from Feb 2025

GB300B300 GPUs (Blackwell Ultra)First deployed Jul 2025