How many M.2 slots does this motherboard have, and what PCIe generation do they support?

It has four M.2 slots. The first slot (M2A_CPU) supports PCIe 4.0 x4, while the other three slots (M2P_SB, M2Q_SB, M2M_SB) support PCIe 4.0 x4 via the chipset.

Report 012114. Filed.