Overclocking and RAM

Overclocking a Q9450
What RAM is better for overclocking regardless of price difference?
4-4-4-12 DDR2-800, or 5-5-5-15 DDR2-1066?
What is the purpose of having "faster" RAM? And to "overclock" my system, do I just play with the FSB+multipliers and the core volts? And how do you achieve 1:1 ratio with fsb/ram?
Yes I am a total scrub/noob to overclocking. Be nice!
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More about overclocking
  1. 1066 hands down. The Yorkfields have a lower multiplier so higher FSB is required to hit higher overclocks. Q9450 is 8 x 333 = 2.66Ghz. Non-extreme Core 2 are multiplier-locked. You can only lower it. To overclock it, you increase the FSB. 8 x 400 = 3.2Ghz. The ram will be at 400 x 2 = 800mhz.

  2. Check out the overclocking guides in the Overclocking Forum stickies. Ak is in general correct, but in practice almost all the "DDR2-1066" RAM being sold is just factory-overclocked DDR2-800 RAM anyway, jacked up to ridiculously high voltages. I'd stay far, far away from any RAM spec'd at higher than 2.0V if you care about stability and robustness.
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