My system (P4 2.6, 1GB Ram, GeForce FX5600-256MB) posted 1973 on the 3DMark03 test...
Swapped the 5600 for a 6800GT 256MB card - and the system posted a freaking 10100 on the same 3DMark03 test
Now I can run GTR at 1024x768 32bit and post in game70fps+ --- vs 15fps previously.
One would not think that 800x600 32bit would be "noticably worse" than 1024x768 32bit with Anti-aliasing enabled - but it is like night and day.
If anyone is debating whether the jump from the GeForce 5xxx series to the 6xxx is worth it - stop ebating and start installing...