Nvidia Lowers Published Vera Rubin Bandwidth Figures

Technology · First reported 31 Oct, 20:35 · Updated 20:52

Image: Wikimedia Commons · NASA Johnson Space Center · Public domain

Nvidia’s product pages now list lower HBM4 and NVLink bandwidth figures for Vera Rubin systems. The revisions include larger reductions for the eight-GPU HGX Rubin NVL8; Nvidia has not explained the changes in the supplied coverage.

The NVL72 page lists 19.2 TB/s of HBM4 bandwidth and 3 TB/s of NVLink 6 per GPU, down from 22 TB/s and 3.6 TB/s.
For the HGX Rubin NVL8, listed system memory bandwidth fell from 176 TB/s to 130 TB/s, and capacity from 2.3 TB to 2 TB.
The article says AMD’s published Helios and MI455X figures exceed revised Nvidia figures on some bandwidth measures, but neither set of figures is benchmarked.

Summary written by Lux AI from 2 articles

Key facts

NVL72 HBM4 bandwidth per GPU: 19.2 TB/s, down from 22 TB/s.
NVL72 NVLink 6 bandwidth per GPU: 3 TB/s, down from 3.6 TB/s.
HGX Rubin NVL8 system memory bandwidth: 130 TB/s, down from 176 TB/s.
NVL72 memory capacity per GPU: 288 GB; the article says this figure is unchanged.