there are also some cases in which the extra frequency increase doesn't dictate any increase in performance. the best ddr2 800/1066 low latency mems, can beat ddr3 1066/1333 high latency mems...
so its not necessary to pair quad cores with ddr3 mems, not even for performance reasons...
you can barely even see any difference with the new am3 platform from am2 ones when running on similar configurations and only the memory is different (ddr2 vs ddr3)... wala untay fanboi masuko, hehehe