Cable-20/24PIN converts 1 x ATX 20PIN to 1 x ATX 24PIN connector. ATX 24PIN connector is for new version motherboard. If you want to upgrade your computer with a new version motherboard, you just need a Cable-20/24PIN for your power supply upgrade. If you have one Cable-20/24PIN, you will never worry about what kind of ATX connector a new power supply has.