Google didn't invent the Clos network, either, but it took years before they started talking about its adoption and with what kind of proprietary twists. Same w

Google didn't invent the Clos network, either, but it took years before they started talking about its adoption and with what kind of proprietary twists. Same with power supplies. You're right, a PCIe switch is not special, unless maybe it's integrated in some unconventional way. It's in Google's DNA to be cagey by default on a lot of details, to avoid giving ideas to the competition. Or misleading others down rabbit holes, like with shipping container datacenters.