[SOLVED] - B550 M.2 Slots and PCIe slots binations
msi slotB key slot for ‘B’Key card (also known as Socket 2) (SATA) M key slot in ‘M’Key card (also known as Socket 3) (PCIe x 4) B+M Key cassettes are available for both cassette slots. Check HDD and SSD support specifications.Motherboard MSI Z77A