They could also use POWER9, which was actually the first CPU on the market with PCIe4.0 support.
Because Intel isn’t going to have internal prototypes that are ahead of what they sell at Best Buy?
Even if they have prototypes, they’re just prototypes. If Intel doesn’t test with existing, production-ready PCIe 4.0 processors like AMD or POWER, they’re morons.
And the third party testers they’re soliciting on twitter probably don’t have prototype Intel processors either.
Iirc, they’re actually shipping PCIe gen 5 products right now, Intel Agilex I think.