ATX power supply would fit in Dell optiplex 960 DT Desktop case??

[eemo2004]

in planning to install a new power supply and the problem is i don't know what size of power supply should i buy because my 255W AC255AD-00 Dell Power Supply have a different size than the normal power supplies and im afraid that the power supply that i will buy wont fit with my case... thanks

 

[Dark Lord of Tech]

It won't support a standard ATX PSU...Sorry.