Which Slot Should You Use?

Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express

2: one with a B key and one with a M key to PCI-E x4 adapter that can take multiple lengths of drives socket types B+M keyed

m2 slot pc Two types of SSD Note: SSDs using the PCIe x4 bus use M-keys since it is the only one that supports PCIe x4 lanes

m2 slot screw Key E normally has PCIe x2, which is not as fast as PCIe x4 for other key types But still Can I attach a standard NVMe SSD to this socket?