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TechFading · day 5

Nvidia testing lower-memory Rubin Ultra due to HBM shortage

Memory supply constraints force Nvidia to prototype configurations with as little as 192 GB instead of planned 1 TB.

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Nvidia testing lower-memory Rubin Ultra due to HBM shortage
tomshardware.com

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Summary, timeline and people extracted by Claude from 7 items across 4 sources · 5h ago. Quotes are verbatim.

Nvidia is testing multiple lower-memory configurations of its upcoming Rubin Ultra GPU accelerator due to inability to secure sufficient HBM4E supply, according to reporting from The Information. Prototypes include versions with 192 GB and 256 GB of memory, and use HBM4 instead of the originally announced HBM4E, marking a significant downgrade from the 1 TB initially shown.

  • Nvidia is prototyping Rubin Ultra configurations with 192–256 GB of memory instead of the announced 1 TB, driven by HBM supply shortages.
  • The company is testing HBM4 instead of the more complex HBM4E to ease manufacturing and supply constraints.
  • HBM4E's customizable base logic die—a complexity feature—has strained suppliers' ability to meet Nvidia's demand.
  • Memory constraints are actively limiting the number of Rubin Ultra racks Nvidia can produce, forcing chip redesign around available supply rather than optimal specs.

How it unfolded

  1. Reaction Reddit discussion frames chip redesign around memory constraints

    Reddit user characterizes the situation as Nvidia redesigning its flagship chip around available memory rather than optimal specs, noting the memory shortage is limiting rack production.

    “NVIDIA's testing configs with as little as 192GB of HBM, down from a planned 1TB, and even stepping back from HBM4E to HBM4. Not for performance, purely because the memory shortage is bad enough that it's limiting how many racks get built.”

    Novel-Lifeguard6491 · r/stocks ↗
  2. Report Tom's Hardware details tested configurations: 192 GB and HBM4 downgrade

    Tom's Hardware reports Nvidia is testing Rubin Ultra configurations with as little as 192 GB of memory and HBM4 instead of HBM4E, citing complexity and supply strain on the advanced memory standard.

  3. Report The Information reports Nvidia testing lower-memory Rubin variants

    The Information breaks news that Nvidia is weighing lower-memory versions of Rubin Ultra GPU due to HBM supply constraints, with at least three tested versions.

What people are saying verbatim

“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.”

Tom's Hardware · Tom's Hardware

“NVIDIA's testing configs with as little as 192GB of HBM, down from a planned 1TB, and even stepping back from HBM4E to HBM4. Not for performance, purely because the memory shortage is bad enough that it's limiting how many racks get built.”

Novel-Lifeguard6491 · Reddit ↗

“The complexity of HBM4E has reportedly caused a strain on supply, with memory manufacturers unable to keep pace with Rubin Ultra's rollout.”

Tom's Hardware · Tom's Hardware

“Our roadmap is intact.”

Nvidia · Tom's Hardware ↗