GPU Diversification: AMD MI455X & MI430X Challenge Nvidia Rubin

AMD unveils MI455X with 320B transistors, 432GB HBM4, 40 PFLOPS FP4, Helios rack 72 GPUs, 2.9 EFLOPS – shipping Q3 2026, volume H1 2027. Also MI430X delivers 288 TFLOPS FP64, 9x Nvidia's Rubin native, strengthening HPC/AI lineup. AMD earnings preview highlights MI350 ramp and Helios orders, signaling AMD's ability to capture AI infrastructure spend. Provides DePIN networks with viable alternatives to Nvidia, reducing dependency and potentially easing supply constraints.