NVSwitch
NVIDIA's switch chip that fully connects all GPUs in a scale-up domain and can do in-network reductions.
Current numbers
NVIDIA RA up to 142 kW; Lenovo 135 kW TDP, up to 155 kW peak, ~90% liquid / ~10% air; HPE 132 kW nominal, ~155 kW EDPpGB300 NVL72 rack by vendor. Lenovo: CPUs, GPUs, NVSwitch liquid; optics, storage air. HPE advises provisioning busways for 192 kW.
Hopper: 8 GPUs/CVM; Blackwell: up to 8 GPUs/CVMGPUs per confidential VM: Hopper, eight (four-NVSwitch air-cooled HGX) with unencrypted NVLink; Blackwell, up to eight with encrypted NVLink