What socket does it plug into?

If you have an M.2 socket on your motherboard them that is where it goes. If you don't have an M.2 socket you can buy a PCI-E adapter which lets you use it. Be sure that your motherboard Bios supports ACHI and allows you to boot from a PCI-E device. This is a little tricky as far as the MBR/GPT format option but once you get it done it is very fast drive.