Posted 13 May 2012 - 04:32 AM
Tell us a bit more about your computer so we can talk about your situation specifically.
In general, when you install a new video card, all resources will go to the new one. Aero doesn't even make a high end card twitch, you'll have pretty much all of your GPU for use. Consider the rest of your computer when you get a new video card; will the new card create a bottleneck effect on the other parts of your system?
Also, you might want to consider getting some more RAM. It is highly recommended to have at least 2 GB when running Windows 7.