Power A Serial ATA Hard Drive From A Conventional LP4 Power Supply Connection This 17cm, 4-pin (LP4) Molex to SATA power adapter cable features one 4-pin Molex (LP4) male connector and one female SATA power connector, allowing you to power a Serial ATA hard drive from a conventional LP4 connection. This eliminates the need to upgrade the computer power supply for compatibility with the SATA hard drive.