Citation :
After personal experiences, and reading reviews, the overall performance of a P4 2.6C processor with 800FSB and HT, at 250FSB, which is 3.25Ghz for the CPU, if you have PC4000 ram running syncronised with the FSB at 250 using timings of 3-4-4-8, it will perform exactly the same as the PC3200 ram running at 200mhz using 5:4 ratio with FSB with 2-2-2-5 timings. I can't really say exactly but +-2% I can call that margin of error. However this is only applies to I865PE/I875P Intel chipset, because of the dual channel memory, any other chipset likes the extra frequency rather than timings.
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