I don't have precise information on the exact number of fan sockets on this motherboard. However, ASRock motherboards in this range usually include multiple fan sockets, often with auto-sensing and fan curve adjustment capabilities. For precise details, I recommend that you consult the manufacturer's manual or official website.

Yes, the WD Black SN850X is compatible with this motherboard. The product has 3 PCIe M.2 slots supporting PCIe Gen4/Gen5 standards, and the SN850X uses the PCIe Gen4 x4 standard, which matches the motherboard's M.2 connector specifications. No restrictions specific to this SSD model are mentioned in the official resources consulted. For optimum installation, check that the SSD firmware is up to date and consult the motherboard manual for M.2 slot location recommendations (some may share PCIe lanes with other components).