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NVIDIA lowers Rubin GPU memory and NVLink bandwidth in its shipping specs as first production racks arrive
What changed
ServeTheHome reports that NVIDIA's shipping specifications for the Rubin GPU list 19.2 TB/s of HBM4 memory bandwidth, down from a preliminary 22 TB/s, and 3.0 TB/s of NVLink, down from 3.6 TB/s, while scale-out networking rises from 0.4 TB/s to 0.45 TB/s. Compute (50 PFLOPS NVFP4 inference) and 288 GB of HBM4 are unchanged. The Vera Rubin NVL72 rack falls from 1,580 TB/s to 1,400 TB/s of memory bandwidth, and HGX Rubin NVL8 drops from 2.3 TB to 2.0 TB of HBM4. NVIDIA had labelled the earlier figures preliminary and has not said why they changed.
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