According to IT之家, Nvidia has adjusted specifications for its Rubin GPU system in its October 2026 documentation compared to archived June documents. The Vera Rubin superchip's HBM4 memory bandwidth was reduced from 44 TB/s to 38.5 TB/s, while NVLink bandwidth was cut from 7.2 TB/s to 6 TB/s. Network bandwidth for horizontal scaling increased from 0.8 TB/s to 0.9 TB/s.

The HGX NVL8 system saw its HBM capacity decrease from 2.3 TB to 2 TB, bandwidth drop from 176 TB/s to 130 TB/s, and NVLink Switch bandwidth reduced from 28.8 TB/s to 24 TB/s.

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