How many M.2 SSD slots does this motherboard have and what are their specifications?
The motherboard has 2 M.2 slots (Key M). M2_1 supports PCIe 4.0/3.0 x4 and SATA 6Gb/s with 2242/2260/2280/22110 devices, while M2_2 supports PCIe 3.0 x4 with 2242/2260/2280 devices. When installing PCIe SSD in M.2_2 slot, PCI_E3 slot will be unavailable. (Page 17, 29)
From the official Msi B550-A Pro Motherboard manual, page 17
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