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Nvidia Rubin Ultra GPU faces HBM downgrade, capacity slashed from 1TB to 192GB

By PulseAugur Editorial · [2 sources] ·

Nvidia's upcoming Rubin Ultra GPU has reportedly seen a significant downgrade in its High Bandwidth Memory (HBM) capacity. Initial previews suggested 1TB of HBM, but the production version is now expected to ship with 192GB of HBM4, a reduction that is also lower than the standard Rubin GPU's 288GB. This downgrade is attributed to changes in the number of stacked memory dies and a reduction in stack height, alongside a shift to HBM4 dies with lower capacity compared to HBM4E. AI

IMPACT Reduced HBM capacity on Nvidia's Rubin Ultra could impact AI training and inference performance, potentially affecting the cost-performance ratio for AI workloads.

RANK_REASON Report on a significant change in specifications for an upcoming GPU from a major hardware vendor.

Read on X — SemiAnalysis →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

Nvidia Rubin Ultra GPU faces HBM downgrade, capacity slashed from 1TB to 192GB

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0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
Report on a significant change in specifications for an upcoming GPU from a major hardware vendor.
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2 independent sources
Multiple independent publishers reporting the same story raises confidence that it's real and newsworthy.
Topics
model release, infra
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High
Clearly on-topic for AI-industry coverage.
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17 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

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COVERAGE [2]

  1. X — SemiAnalysis TIER_1 English(EN) · SemiAnalysis_ ·

    This and more is contained in the SemiAnalysis Accelerator Model, where we first broke this news to subscribers in July. Subscribe to find out more on the impli

    This and more is contained in the SemiAnalysis Accelerator Model, where we first broke this news to subscribers in July. Subscribe to find out more on the implications, what Nvidia is doing to offset lower capacity per GPU, and our views on where HBM specs are heading in the http…

  2. X — SemiAnalysis TIER_1 English(EN) · SemiAnalysis_ ·

    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 whi

    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 https…

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