Video card add-on for Optiplex 3020 SFF

Hi guys,

Due to extensive plotting and graphic application I need to add an additional VGA / video card into my Optiplex 3020 SFF.

All I know that I need a low profile video card which form factor can fit the space in the CPU box.

But I heard that I also have to consider the wattage.

So, if anybody knows which video card tested and known to work with this desktop, please enlighten me

TIA