I'm running a Q6600 at 3.0 GHz (333*9), and I read on a forum somewhere that I should run my FSB and memory frequency in a 1:1 ratio. That means the memory I have, DDR2-800 is running at 667 in order to maintain the 1:1 ratio. Am I missing out on performance by not having the memory running at 800?
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No, you won't be missing anything major. The performance difference is minimal, if any. Just lower your timings accordingly.
The stock timings are 5-5-5-15, so should I change anything?
You could probably bring it down to 4-4-4-12. You might need to adjust the voltages, but give it a try. Run Prime95 or Orthos blend test for at least 8hours to check for stability.