Sorry, I have a noob question to ask. someone told me that a pair of ram juz run at 320MHz, may i know why? is it due to the difference in chipset? it is apacer pc3200 512 ram. and he told me that the kingston ram he bought run at 400MHz. can run until tat high? if not mistaken, he is using dual channel. 4 slot for 4 pieces of ram ? then is the principal of the slot state by the author apply? for the 64-bit one.