SemiAnalysis(@SemiAnalysis_):NVIDIA has revised Vera Rubin NVL72’s NVLink bandwidth from 3.6 TB/s to 3.0 TB/s per Rubin GPU package, a ~17% reduction. Vera Rubin utilizes bidirectional SerDes, with a theoretical full-rate bandwidth of 448 Gbps per physical connection. However, crosstalk, insertion loss, and return loss create significant signal integrity challenges at these speeds. (1/2)🧵

2026.10.30 03:03

NVIDIA has revised Vera Rubin NVL72’s NVLink bandwidth from 3.6 TB/s to 3.0 TB/s per Rubin GPU package, a ~17% reduction. Vera Rubin utilizes bidirectional SerDes, with a theoretical full-rate bandwidth of 448 Gbps per physical connection. However, crosstalk, insertion loss, and return loss create significant signal integrity challenges at these speeds. (1/2)🧵