---
type: "Topics"
locale: "en"
url: "https://longbridge.com/en/topics/100000000923714.md"
description: "🚨Custom HBM frees up die space for compute🚨On Rubin, HBM controllers and PHYs take up roughly 16% of the GPU die. On Feynman with NVHBM, we estimate that falls to ~4%.How: the memory controller moves off the XPU and onto the HBM base die, and the wide standard PHY is replaced by Nvidia's compact NV-HBI die-to-die link. Samsung's custom HBM4 interface is ~60% smaller than its standard PHY.Nvidia claims up to 25% more die area for compute, up to 30% more bandwidth, and 15% lower HBM power vs standard HBM4E. (1/2)🧵"
datetime: "2026-10-03T03:05:22.000Z"
locales:
  - [en](https://longbridge.com/en/topics/100000000923714.md)
  - [zh-CN](https://longbridge.com/zh-CN/topics/100000000923714.md)
  - [zh-HK](https://longbridge.com/zh-HK/topics/100000000923714.md)
author: "[@SemiAnalysis](https://longbridge.com/en/profiles/2078041753485574144.md)"
generator: "portal-rs"
---

# 🚨Custom HBM frees up die space for compute🚨On Rubi…


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> **Disclaimer: This article is for reference only and does not constitute any investment advice.**