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Re:PCIe 8.0 Announced by the PCI-Sig Will Double Throughput ... by zamadatix on Wednesday August 13, 2025 @07:59PM (#44895323)
At least the GB200s OpenAI purchased have CX-8s, but it's very possible (perhaps even very likely) most of the millions of GB200s were with PCIe 5.0 and CX-7s given the SuperMicro spec sheet.

Edit: found the SemiAnalysis post saying as much https://x.com/SemiAnalysis_/status/1947768988467138645/photo...

Re:PCIe 8.0 Announced by the PCI-Sig Will Double Throughput ... by _zoltan_ on Thursday August 14, 2025 @07:35AM (#44899194)
thanks! very interesting that they got a custom SKU.