You are correct about HBM2 (latencies between 12 and 16ns vs 8-12ns latencies in typical DDR4 systems). My understanding was that HBM3 reduces those latencies a

You are correct about HBM2 (latencies between 12 and 16ns vs 8-12ns latencies in typical DDR4 systems). My understanding was that HBM3 reduces those latencies and HBM4 potentially reduces them even further (in addition to lower latency due to closer proximity). AMD seems considers HBM on-chip to be an upcoming reality. https://www.guru3d.com/news-story/amd-working-on-vertical-(3d)-stacking-of-dram-onto-processors,2.html https://www.guru3d.com/news-story/amd-working-on-vertical-(3...