Nvidia trims HBM4 bandwidth for Rubin platform, sources say

DIGITIMESOctober 29, 2026en

Nvidia is reportedly adjusting the fourth-generation high-bandwidth memory (HBM4) specification for its Vera Rubin NVL72 platform, cutting bandwidth per GPU from the previously announced 22TB/s to 19.2TB/s, a reduction of about 13%. South Korean industry observers said the move could increase supply flexibility and help balance performance with mass-production delivery, although the reason for the change and its actual impact on supplier orders remain unconfirmed.

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