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Toms HW have an interesting article atm about how an i3 goes compared to an i7 for single cards... the i3 was faster... its not until you get 2 or 3xfire that cpu bottleneck comes into play with modern chips.
AFAIK your 5600 dual core shouldnt be a large bottleneck in single card gaming - go a 58xx if you got the cash.
I have to disagree here, especially in newer games.
A 2.8 Dual core will defintely be a bottleneck, especially if you want a smooth 60fps at high resolution.
Although most games it should be fine, i wouldnt expect it to cope further down the line.
In terms of a graphics card a 5850 is without a doubt the best bang for buck atm.
Most can clock to 5870 levels also. With almost exact same performance.
Edit: My bad double post, my connection is terrible at work..
Perhaps i am not giving enough credit to an x3 720 (2.8Ghz triple core) cause i assumed it wouldnt be a vast amount faster than a 2.8ghz older dual...
the x3 (what a ~$60- chip) was within a couple of % (either way !) of an i7 870 (~$500- chip) with a 5850 for mw2, dirt2 etc etc.
I took from those results that at this point games are still GPU limited with a single card.