there was a very good comparison on some site..i think it was on an OCZ site where they did such comparisons.
As far as i remember...CPU speed, then mem speed
Some very few theoretical applications preferred a litle lower mem speeds but at tight timings, but for overall and real life performance more mem speed is better even at lose timings - so 500 mhz at 5.5.5.15 would be better than 440 4.4.4.12 (just as an example)
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