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RE: ram question
Yes.
But Dual Channel has nothing to do with the "Double Data Rate", basically, Dual Channel is to RAM what RAID0 is to Hard Disk Drives, it just expands the width of the memory bus, allowing data to be transferred faster.
And as for RAID0, data modules have to be of same capacity, and preferably of the same frequency (if not, the motherboard will just use them at the highest speed allowed by the slowest of the two modules).
About frequencies, DDR is often referred to as "DDR400" or "DDR667", etc., but they actually operate at half these frequencies (==200 or 333MHz). But as they're "Double Data Rate", they are able to send two data "words" per cycle, hence the doubled frequency.
Another denomination used for DDR2-667 is "PC2-5300" (e.g.), the 2 standing for DDR2, and 5300 means it has a maximum data bandwidth of 5.3GB/s.
For DDR400 it would be PC-3200.
Hope it's clear enough =)
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