[NAME]  There is no upgrade for 8940 past the dell proprietary 500W. Your assertion that any 3rd party PSU or adapter exists or fits and works is speculative. post should be examined for accuracy as well as in the interest of safety and property damage. The listing says Dell Optiplex 3050/3060/5050/7040/7050/7060/7070/7080 MT, Dell VOSTRO 3650/3653/3660/3667/3668/3669/V3267  Which tells me that Its absolutely WRONG. Does not work with G5  8940  7080 systems. DELL OEM Proprietary part # 2VD0G 360w Liteon5K7J8 500w Delta99TPH 500w LiteonY7R0X 500w Chicony Neither Comeap or Moddiy or any other vendor have an adapter. If you contact them they will both tell you that there is no adapter. The adapter that is for 7050 DOES NOT and WILL NOT work for a G5 8940 7080. The EPS 12v connector will not work on the dell proprietary DUAL 4 pin motherboard connectors. All TFX supplies will not mount in the case let alone power the correct connections to the motherboard. Six pins is not a standard and dual 4 pins is not a standard. CPU connectors are not GPU connectors. Number of pins and fitting into the socket are not a working solution. Anything other than the Dell proprietary units are not tested/validated by Dell. [IMAGE]Dell does not use these standards on G5 8940 7080 [IMAGE]  
[URL] stock psu is TFX with dimensions 85x65x225 mm.  max OEM psu: 500w.  proprietary 6 pin + two 4 pin cpu Silverstone TX700 80 plus gold psu  85mm (W) x 65mm (H) x 175mm (D) use 24 to 6 pin adapter [URL] [IMAGE][IMAGE]  
XPS 8940, 700W TFX PSU upgrade