IX2-0261
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Nvidia Blackwell Perf TCO Analysis - B100 vs B200 vs GB200NVL72 - Line hint:
432
Context Before
Source: SemiAnalysis InferenceX ↗
As mentioned earlier in the article, B300 servers only connect at most 8 GPUs using the 900GByte/s/GPU NVLink scale-up network whereas GB300 NVL72 servers connect 72 GPUs using the NVlink scale-up network. So when we need more than 8 GPUs (but less than 72 GPUs) for the inference setup, we need to bring in multiple nodes of B300 servers to form our inference system which means communications falls back to the lower InfiniBand XDR scale-out network featuring 800Gbit/s (uni-di) per GPU of bandwidth. Compare this to a rack scale GB300 NVL72 which connects 72 GPUs over NVLink delivering 900GByte/s (uni-di) per GPU of bandwidth and we can see that the rack-scale server allows the GPUs in the inference setup to talk to each other with over 9x higher bandwidth compared to the case of the multiple nodes of B300 servers.
Evidence
SemiAnalysis is free open source software and reader-supported
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③ Semantic Frame
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