# SemiAnalysis explains how HBM5 doubles bandwidth with the same 2048 pins

> Original title: 🚨 HBM5 Doubles Bandwidth Without Adding a Single Pin 🚨

- Source: SemiAnalysis
- Published: 2026-11-10T05:28:08.000Z
- Bad Influence: https://badinfluence.news/items/opai85mqua8i5q6uzbbl9c5ld
- Original: https://x.com/SemiAnalysis_/status/2120025695283785966

## Summary

SemiAnalysis says HBM5 keeps the same 2048 pins as HBM4E while nearly doubling each pin's speed, citing Samsung's Hot Chips 2026 presentation. Pin speed rises from 14 Gbps on HBM4E to over 28 Gbps on HBM5. SemiAnalysis says the DRAM banks, TSVs, and base-die PHY also double to keep each pin fed.

## Post

🚨 HBM5 Doubles Bandwidth Without Adding a Single Pin 🚨

HBM5 keeps the same 2048 pins as HBM4E and runs each one nearly 2× faster. Samsung's Hot Chips 2026 presentation shows pin speed going from 14 Gbps on HBM4E to over 28 Gbps on HBM5.

Faster pins are only half the story. To keep each pin fed, everything behind the pins doubles too: DRAM banks, TSVs, and an upgraded PHY on the base die.
Here's how it works, explained as a grocery store 🛒 (1/6)🧵

![](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Fmedia%2FHWvYIo4X0AA_s-s.jpg&mode=thumb&exp=1794528000&sig=cacf2756031bb6b9)