The Serial Cables PCIe Gen4 m.2 adapter (PCI4-AD-x4M2-04-G4) allows test labs and users to add an extra Gen4 slot PCIe x4 to desktops and servers with a supported motherboard. Traditionally, m.2 adapters offer enterprises a cost-effective boot-drive alternative for servers (without taking up a front-mount slot); however, this highly customizable adapter can be used for much more than that.