SemiAnalysis explains how HBM5 doubles bandwidth on the same 2048 pins

SemiAnalysis says HBM5 keeps the same 2048 pins as HBM4E while nearly doubling the speed of each pin, citing Samsung's Hot Chips 2026 presentation.

According to the post, pin speed rises from 14 Gbps on HBM4E to over 28 Gbps on HBM5.

SemiAnalysis says the DRAM banks, through-silicon vias (TSVs), and base-die PHY also double to keep each pin supplied with data. The post is the first of a six-part thread that explains the design using a grocery store analogy.