CABLE-DELL-X extends one 6pin Aux connector from 20 pin ATX connector. 6pin Aux connector is necessary for some of the Dell PCs. Therefore, if you want to assemble your power supply without an Aux connector in the Dell PCs, CABLE-DELL-X can satisfy your need. ONLY 100% compatible w / AP-MPS3ATX25, AP-MPS3ATX30, AP-MPS3ATX40, AP-MPS3ATX47E, KW-PS325W, KW-PS340W, JPS3-300, JPS3-400, & MPS3H4-2507; the other brand name PSUs are not guaranteed.