How Many M 2 Slots Does the ASRock B450 Pro4 Have?

The ASRock B450 Pro4 has a total of four M.2 slots. Two of the M.2 slots are located on the back of the motherboard, while the other two are located on the front of the motherboard.

The two M.2 slots on the back of the motherboard are located directly below the PCI-E x16 slot and the PCI-E x1 slot. The two M.2 slots on the front of the motherboard are located directly below the CPU socket and next to the SATA ports.