Tomshardware VGA CHARTS and see where they stand. I will share I changed a Nvidia 9500 GT 512MB for a Nvidia 220 1GB card (not the overclocked one) and the power draw dipped.

The 9500 in the machine averaged 120 Watts.
The 220 now draws 100 Watts for the entire machine.

The Windows score went from 5.2 to 7.2 so for less Watts I got more punch.

I'd stick with the 210.