MSI equips the B660M Mortar with two PCIe x16 (one Gen 4 the other Gen 3) slots and a single PCIe Gen 4 x1 slot. There are two M.2 slots, both of which have a thermal heat sink finished in the same brushed silver as the rest of the motherboard. The PCH heatsink is coated in the silver palette and embossed with the ‘Mortar’ trademark. Additionally, the board features six SATA III ports. The rear panel connectors include three USB 3.2 Gen 2 Sort-A ports, one USB 3.2 Gen 2 Type-C port, four USB 3.2 Gen 1 ports, HDMI, Display-Port, a 2.5G Ethernet port, two WiFi6E antennae, and a seven-channel audio jack array.

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