# Nvidia Rubin Ultra HBM4 容量大幅缩水至192GB

- 来源：SemiAnalysis (@SemiAnalysis_)
- 发布时间：2026-08-25 05:00
- AIHOT 分数：60
- AIHOT 链接：https://aihot.virxact.com/items/cmt7qmxy12duqro73c8inmqhw
- 原文链接：https://x.com/SemiAnalysis_/status/2091994110911557679

## AI 摘要

Nvidia Rubin Ultra 将搭载 192GB HBM4 8-hi，较最初预览的 1TB HBM 大幅缩水，甚至低于常规 Rubin 的 288GB。容量削减主因：4 die 方案取消致 cube 数降至 8、堆叠高度从 16-hi 降至 8-hi、改用 24Gb die 的 HBM4（而非 HBM4E 的 32Gb），未来或可升级至 8-hi HBM4E。

## 正文

HBM MASSIVE CONTENT DOWNGRADE ALERT🚨🚨: Nvidia Rubin Ultra will ship with 192GB of HBM4 8-hi. Not only is this a huge downgrade from the original Rubin Ultra which was previewed with 1TB of HBM, but it is even lower than regular Rubin which has 288GB. How did HBM content for Rubin Ultra get cut to 1/5th of the original? The number of cubes got cut to 8 when 4 die Rubin Ultra was scrapped. Then the stack height got reduce to 8-hi instead of 16-hi. Last it is cut to HBM4 which uses 24Gb dies instead of 32Gb dies with HBM4E, although an 8-hi HBM4E upgrade could com later. What was Nvidia's reasoning behind this? (1/2)🧵