When would i need a cpu/ mobo upgrade?

[Monkey_feces]

Right now I have a pretty pathetically clocked 2050mhz e6300 thanks to my crappy motherboard. If I had the hardware to magically remove the video bottleneck in games, what percentage of software would be limited by my cpu at the 1280x1024- 1680x1200 (or w/e 22" widescreens are) resolution range?

I plan to upgrade when 25% of new games would make my cpu a limiting factor. Can anyone play fortune teller for when that would happen?