Ooh, nice to see you took the plunge and went for the 4890, that's some serious horsepower.
Well the problem is you can't upgrade the processor without feeling some serious pain in your wallet. The perfomance differences between the 920 and 940 are miniscule and do not justify the latter's $300 higher price tag. The performances differences between the 920 and 965 are marginal and in no way, shape or form justify the extra $750! Basically you don't have any sensible options beyond the 920 and in 6-9 months time when the latest i7 chips hit the market you'll kick yourself for spending so much money on the 940 or 965. If you're insistent on staying future proof for the next 4-5 years then hold off until the end of the year to see what your CPU options will be. But believe me, upgrading to the latest and greatest 3D card in 2-3 year's time will do wonders for your framerates.
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