400W Power Supply Upgrade for Dell Slimline Optiplex 390 790 990 7GC81 6MVJH Guaranteed tofit your model Slimline Computer List below 1 x Main connector (20+4Pin) This works with both 20 pin and 24 pin main connectors! 1 x 12V P4 connector, 2 x 4-pin Molex Connector, 2 x SATA (Serial ATA) connector 400 Watts - This is an upgrade with additional wattage for additional devices, this replaces lower wattage power supplies Other Compatible Part Numbers:CYY97, 3MV8H, 6MVJH, 3MV8H, L250NS-00, PS-5251-08D, DPS-250AB-67 A.