Dell OptiPlex 7050 tower shipped with 240w power supply Dell OptiPlex 7050 small form factor has 180w power supply They are Dell propriety in both technical and shape, form. To use aftermarket power supply, users could modify chassis to fit and using adapter cable to convert 24-pin ATX to 6-pin Dell motherboard connector.
What supply power can go on my PC? or I can put what ever supply power I want, because I have a 180w supply power but I want to upgrade it to a 400w to be able to run a Graphics Card, or my OptiPlex 7050 only supports Dell supply powers 
What power supply goes on my dell Optiplex 7050