DDR2 1066 vs 1200

[frodo199]

a. I get lost a bit with newer intel CPUs. Correct me if im wrong, DDR2-1066 uses 266Mhz chip, while 1200 uses 300Mhz. Therefore, if you are buying q9550, both would need to be overclocked?.. since the bus multiplier is 8.5x333 = 2.83Ghz.
b. If both RAM can be used for q9550 w/o overclocking, would it give performance increase using DDR2 1200 instead of 1066?

TIA for the feedback

 

[cjl]

Actually, DDR is double data rate. Therefore, 1066 is 533MHz base clock rate, and 1200 is 600MHz. Both are higher than needed on a Q9550, which actually needs more like DDR2-667 or DDR2-800 (probably the best choice, as DDR2-800 would allow for a 1:1 ratio with a 1600MHz FSB, which would be an overclock to 3.4GHz). 1066 would allow for a 1:1 ratio all the way up to a 2132MHz FSB, which is an overclock to over 4.5GHz.