NVIDIA GB200 Grace Blackwell Superchip 372GB

The NVIDIA GB200 Grace Blackwell Superchip is the building block of the GB200 NVL72 rack: one 72-core Grace CPU joined to two B200 GPUs over NVLink-C2C at 900 GB/s, with 372 GB of HBM3e at 16 TB/s across the pair and 480 GB of LPDDR5X on the CPU side. Every performance figure on this page is for the whole superchip, so it is twice a single Blackwell GPU: 20 PFLOPS of dense NVFP4, 10 PFLOPS of dense FP8, 160 TFLOPS of FP32. Two things follow from the packaging rather than the silicon. The GPUs in a superchip are binned slightly above a standalone B200, so per-GPU dense NVFP4 is 10 PFLOPS here against 9 on an HGX B200 board. And because the CPU is coherently attached rather than sitting behind PCIe, a model can address CPU memory at NVLink speed instead of being staged across a bus, which is the practical reason 72-GPU racks are built from these rather than from discrete GPUs and separate hosts. Thirty-six superchips make an NVL72.