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#31
You don't, but if it can run at 100+fps then with vsync enabled you will have a solid 60FPS.
As for the eye not being able to notice more than than 24fps, technically that may be true - but when it comes to games 24FPS vs 60+FPS is VERY noticeable.
For the OP, as others have mentioned, it's your CPU that is the bottleneck.
At a res of 1680x1050, a Video card is only just starting to take the majority of the workload off the CPU.
Resolutions below 1680x1050, it is the CPU that is still doing most of the work.