In numbers, an HBM3 stack can reach 819 GB/s of bandwidth and have 64 GB of capacity. In comparison, the HBM2e stacks used by the AMD MI250 have half the bandwidth, 410 GB/s, and a quarter of the capacity, a mere 16 GB.
https://www.techspot.com/news/93182-hbm3-twice-fast-hbm2e-up-819-gbs-stack.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/93182-hbm3-twice-fast-hbm2e-up-819-gbs-stack.html?utm_source=dlvr.it&utm_medium=blogger