Must Have Gadgets 24 pin to 8 pin ATX Power Supply Adapter Cable for DELL Optiplex 3020 7020 9020 Precision T1700 Converts standard 24 pin ATX power supply connector to 8 pin power supply connecter Connector A: 24 pin ATX Power Supply Connector B: 8 pin DELL motherboards H61 H81 Q77 Q87 B75 A75 Q75 Q65 Compatible with Optiplex 3020 7020 9020 and Precision T1700 models Recommended to be installed by professional technicians