Report: NVIDIA Rubin Ultra May Downgrade to HBM4 with Fewer Stacks

Reports suggest NVIDIA's next-gen Rubin Ultra GPU may see memory downgrades, with HBM stacks cut from 12-high to 8-high, or falling back from HBM3e to HBM4, indicating a slimmer memory subsystem than originally planned.

2026-08-29 ~ 2026-08-30 · 2 related posts

• Nvidia's Rubin Ultra reportedly downgraded to 8-High HBM4 — kevinsxu · 2026-08-29

1 near-duplicate retellings: AccBalanced