that article is from last March. the plan was indeed for the GB200 board to support gen6 but it didn't happen and GB300 will rectify it.

at least that's my best educated guess, looking at supermicro's public spec sheet and that it's shipping with CX7 which is Gen5 and not with CX8.

B200 supports Gen6 there is just nothing that would let it run at Gen6.

At least the GB200s OpenAI purchased have CX-8s, but it's very possible (perhaps even very likely) most of the millions of GB200s deployed PCIe 5.0 using CX-7s given the SuperMicro spec sheet.

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