Then there are the newer M.2 SSDs which connect to M.2 connectors on your motherboard. Of course, you need to have free SATA slots on your motherboard as well, but this shouldn’t be an issue unless you have many hard drives already. SSDs don’t use a lot of energy, so it shouldn’t be an issue. If not, you can always get a Y-splitter that allows two SSDs to connect to one molex power slot in your PSU. On a desktop PC, however, if you’re getting a SATA SSD drive, then you’ll need to make sure your power supply has enough spare slots or cables to accommodate the SATA cable connector.