NVLink Multicast

NVLink multicast support requires that unified memory is enabled. For more information about enabling unified memory, refer to the Enabling Unified Memory for a vGPU documentation, or Unified Virtual Memory (UVM) for in-repo coverage.

vGPU Support for NVLink Multicast

Only full-sized, time-sliced NVIDIA vGPU for Compute support NVLink multicast.

Table 36 NVIDIA NVLink Multicast Support

Board	vGPU
NVIDIA HGX B300	NVIDIA B300X-279C
NVIDIA HGX B200	NVIDIA B200X-180C
NVIDIA HGX H800	NVIDIA H800XM-80C
NVIDIA HGX H200	NVIDIA H200X-141C
NVIDIA HGX H100	NVIDIA H100XM-80C
NVIDIA H20 HGX 141 GB	H20X-141C
HGX H20 96 GB	NVIDIA H20-96C

NVLink Multicast Limitations

• NVLink multicast is supported only with full-sized, time-sliced NVIDIA vGPU for Compute profiles. MIG-backed vGPU profiles and fractional time-sliced profiles are not supported.

• Unified memory must be enabled for the vGPU. Refer to the Enabling Unified Memory for a vGPU documentation.

• NVLink multicast requires NVSwitch-connected GPU boards (HGX platforms). PCIe-only GPU configurations do not support NVLink multicast.

• Only the specific board and vGPU profile combinations listed in the support table above are supported.