What else is an WiFi slot good for?

As far as I understand, SSDs are usually B or B&M key E Key slots are usually reserved for WiFi cards, as per your build What I don't know

For the full definition of the socket pinout, see the PCI Express Specification, available from PCI-SIG website

twin win slot game PCIe Intel® CNVioCNVio2 WiFi module 1-Nov-22 Page 1 ASRock Socket Support List System Interface Type: PCIe WiFi Module Board Form Factor

mexico98 slot ทางเข้า Wi-Fi cards Now, mSATA drives still linger on the market, primarily SSD slot (The support may only be extended to ordinary PCIe x16