NVSwitch
NVIDIA's switch chip that fully connects all GPUs in a scale-up domain and can do in-network reductions.
Current numbers
135 kW TDP; 155 kW peak; up to 142 kW facility design basis; ~90% liquid / ~10% airper GB300 NVL72 rack (up to ~155 kW peak); CPUs/GPUs/NVSwitch liquid, optics/storage air
Hopper: 8 GPUs/CVM; Blackwell: up to 8 GPUs/CVMConfidential-computing scope — Hopper: eight-GPU, four-NVSwitch air-cooled HGX per CVM with unencrypted NVLink; Blackwell: up to eight GPUs per CVM with encrypted NVLink