To me people worry to much about bottleneck. What really matters is do you get better performance than with the next card below it.
As an example AMDX4 955BE with HD5870 beats the same rig with HD5850 but it will loose to an I7 @3.2GHz and HD5870 because of CPU bottleneck in the AMD system.
There will be no bottleneck unless the OP's screen is smaller than 1680x 1050.
Never considered that. I did the Experience rating on a smaller screen, though I do have access to a bigger one to compare.
Why is the smaller screen a bottleneck? I would have thought the higher resolution would slow things. (I don't have very much computer knowledge.)
Windows Experience Rating is a joke, NEVER buy your hardware based on that score. I have dual 640Gb drives in Raid0 which are almost twice as fast as a single conventional 7200RPM drive and Windows gives me a score of 5.9
The lower the res the more stress on the CPU, the higher the res the more stress on the GPU so for instance if you are playing at 1024 res and your CPU clock is at 3.3Ghz you will gain FPS by overclocking the CPU. If you are playing at 1080p or higher you will gain FPS by raising the GPU clocks and in this case you can leave the CPU at stock without having to worry about frame loss.