Somebody convince me that more than 2 cores is better for GAMING than a higher clock rate. Please cite actual examples with links. E.G. Crysis does not run better on 4 cores than 2. Are there enough games that do that it would be worth "upgrading" from 2 cores running at 4.4ghz?

I'm trying to decide if I should upgrade GPU from a GTX280 or upgrade CPU from an e8600 @4.4ghz

I'm also currently only running 3gigs of ram, so I'm definitely getting more, but wanted to decide if I'm getting more DDR2 or if I upgrade CPU types I'd need to go with DDR3. If I just update the GPU then I'll just get a couple of 2gig sticks and run 5gigs of ram.