UALink
UALink vs NVLink vs Scale-Up Ethernet: The Scale-Up War
Put 72 accelerators in a rack and ask them to behave as one machine, and the link between them stops being a network in the usual sense. It has to carry loads, stores and atomics at something close to memory timing. Three camps want that job: NVIDIA's NVLink, the UALink Consortium's open specifications, and a set of Ethernet efforts often lumped together as Scale-Up Ethernet. Coverage tends to treat this as a bandwidth race. An archite…