XGMI is a peer-to-peer high-speed interconnect and is based on Infinity Fabric. XGMI is basically AMD's alternative to NVIDIA's NVLink for inter-connecting GPUs. Previously leaked slides indicated that XGMI would be supported on Vega 20 along with PCI Express 4.0. That appears accurate as becoming public today were a set of patches wiring in XGMI support to the AMDGPU Direct Rendering Manager driver and explicitly enabling the functionality for Vega 20. It's also expected AMD's upcoming Naples server CPU architecture will also support XGMI.Do note that this is for the professional market only, and not for the consumer space.