SemiAnalysis· @SemiAnalysis_ · X·· 5 天前AI 评分63
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NVIDIA 将 Vera Rubin NVL72 每 Rubin GPU 封装的 NVLink 带宽从 3.6 TB/s 下调至 3.0 TB/s，降幅约 17%。Vera Rubin 采用双向 SerDes，每个物理连接理论满速率带宽为 448 Gbps，但串扰、插入损耗和回波损耗在该速率下带来显著的信号完整性挑战。
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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)🧵
来源：SemiAnalysis · x.com