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Tom’s Hardware
Tom’s Hardware
Technology
Jake Roach

Nvidia reportedly testing lower memory configs of Rubin Ultra as memory shortage bites back — designs tested include as little as 192 GB and step back to HBM4 [Updated]

Nvidia Memory SK Hynix The Information Micron
Nvidia CEO presenting Rubin Ultra at GTC 2026.

Nvidia is reportedly testing variations of its upcoming Rubin Ultra accelerator with less memory due to concerns it won't be able to source enough HBM. Some versions include just 192 GB of memory and use HBM4 instead of HBM4E, as originally announced, according to The Information. The report confirms an earlier comment from firm SemiAnalysis about a potential Rubin Ultra memory downgrade.

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