Dell Optiplex 740 MT 305W ATX12V Desktop Power Supply N305P-06 NPS-305KB A C248C Brand: HP Power Supply Max Output Power: 305W Form Factor: ATX Compatible Part #: MH495 C248C PH333 NH493 XK215 Compatible Dell Systems: Optiplex 360, 380, 580, 760, 780, 960 Tower Models, Dimension E520, E521