Rip,
Even with your CPU, you should see a considerable FPS increase.
Try installing the 6.50 Detonators.
But before you do, completly remove the drivers you have now. To do this, change your display adapter to Super VGA, and restart.
Press START on the desktop, Find, and do a search inside the Windows directory for "nv" (without the commas) and DELETE all files that appear inside Windows\Inf and Windows\System
Restart, install the 6.50 drivers.
Your Aces High framrate should have increased a lot from your old TNT2 card, even if your CPU is old.
To make sure you are getting more performance, try the 3DMark benchmarks (
www.madonion.com) with BOTH your cards, and tell us what increase you get with your new Geforce PRO.
Also try running Aces High with FSAA and tell me if its playable; it should be.
I still recomend you upgrade that cpu; durons are cheap and fast.