PCIe slot and SATASATA Express confusion

ASUS 600-series motherboard PCIe Q-Release where is the pcie slot PCIe x1 adapter can fit in an x1 or higher slot A larger card, such as a PCIe x16, cannot fit in a lower-numbered slot Figure where''s the gold slot machine free PCIe uses a serial interface and allows for point-to-point interconnections slot size Adapters with smaller speeds are allowed in larger sized

wheres the gold slot machine On the B550M they are aligned perfectly whereas on the B450M the primary slot is underneath the left middle screw So If you're buying an mATX