What is the maximum speed that the FSB of an Athlon XP can run at? Maybe I just haven't looked in the right places, but as far as I can tell, i've only been able to conclude that the maximum FSB of an Athlon XP is 133 Mhz... Since DDR (double data rate) just runs at essentially twice the rate of the FSB, wouldnt that mean that the fastest RAM you could actually use would be DDR266??? So if this is the case, I don't really see the advantage of using DDR333 with an Athlon system, as the FSB will only truly run at 133 and thus your RAM will only really be running at 266...
I'm obviously missing something, any explanation/clues would be appreciated.
In the big picture you are right. The Athlon's cannot fully utilize the higher bandwidth of anything higher than DDR266. The truth is the DDR is running at 333 mhz, via what is known as a "Asymetrical Memory Bus", meaning the memory is running at a different speed than the CPU Bus. This does not change the fact that the Athlon's really don't perform much better using PC2700 vs. PC2100.
Again, DDR333 is running at 333 mhz/ 2X 166mhz(with the KT333 chipsets), but it does not help the performance of the Athlon's, very much.
god knows your entire system setup & he would answer your questions if he could just stop laughing