Q:

Is the Nvidia GT 120 a step up from the 8800 GT? 

The video card on my Mac Pro (early 2008) died.  I had a NVIDIA GeForce 8800 GT 512MB in my machine.   Apple has the Nvidia GT 120 for sale on there site.   The comments on the previous link seem to indicate this will work on a Early 2008 Mac Pro even though it is listed for an Early 2009 Mac Pro.   My question is this:
Is the Nvidia GT 120 a step up from the 8800 GT.   I haven't followed video cards in a while and have lost track. 

A:

The GT 120 is about the same as a 9500GT, which itself is a huge step down from the 8800GT.