AMD MI455X and Helios: 432GB HBM4, 72-GPU Racks, and a Real Answer to Vera Rubin
… Following in NVIDIA’s footsteps, the CPU joins the coherent memory domain over Infinity Fabric instead of sitting behind the GPUs as a plain PCIe host, and AMD argues the 1:4 CPU-to-GPU ratio is deliberate: the core itself outruns the competition, with AMD’s apples-to-apples estimates putting the 5… …