Genuine Dell 305w Power Supply PSU for Dimension 3100, E310, 5000, 5100, E510, 5150, E520, E521, and OptiPlex Towers GX320, GX520, GX620. Dell part numbers: W8185, M8802, M8805, M8806, X8129, C9962, YH542, C5201, D5032, MC164, CX305N-00, L305N-00 From a Dell Optiplex 320