Genuine Dell 280w Power Supply PSU For Small Desktop Systems Optiplex 210L, 320, 330, 360, 740, 745, 755 GX520, GX620 r Dimension C521 and 3100C Optiplex New Style GX280 Systems Part Numbers: F5114, MH596, MH595, RT490, NH429, P9550, U9087, X9072 Model Numbers: AA24100L, D280P-00, H280P-00, L280P-00