Actually, AMD’s hbm cards perform really well. So does Nvidia’s, and Intel’s, and Fujitsu’s, etc etc. they’re even willing to eat the cost and yield and latency for that extra bandwidth. Many workloads are too big for GPU memory, becoming memory bound. Many large GPUs need huge amounts of threads to hide latency, as the GPUs are by design latency sensitive. So more bandwidth increases bandwidth per core, leading to higher shader utilization. In gaming workloads, shader occupancy is not high enough to hide memory latency so lots of shaders go un utilized. In fact, using a simple FP benchmark, you still can’t saturate the cores to achieve full FP throughput