this depends from what you are upgrading
ijsut went from a quad core with 2.6 to a i5 2500k ( with a ram upgrade too! ) - and i didnt gain any graphcial performance, but stuttering lowered a lot ( still, the games stutter, )
i also tested my old quad core wit ha 560 TI, and toug h icould play the graphcis really high, i still had a LOT of stutters.
with the complete setup 560Ti + 2500k, i tested, about the same graphcial performance as the 2md setup, but with the stutters from the first.
so TLDR, processor will reduce stuttering, GPU will give eye candy.
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