Hiya
Right. I have a NIGHTMARE with my Asus board when I got it as my CPU super-air-cooler wouldn't fit with my Twin XMS Pro memory and so I spent time finding out what slot I could put memory in etc.
Bank A1 & A2 (or slot 1 and 3) are your primary dual-channel slots.
Bank B1 & B2 (or slot 2 and 4) will only run as dual-channel if you have memory in the slots above running as dual-channel.
Basically, if you look in the memory config section, you will see what Asus recommend. In theory, you can use Banks B1 and B2 on their own as dual-channel and on some boards they will run as DC and on some they won't. Asus says it won't happen - half of the Hexus users who tried it says they do.
So - fill all 4 slots with matched pairs of memory and you will be fine for dual-channel.
Final comments? You shouldn't really need more than a gig anyway unless you are doing video encoding etc, so why not get yourself 2 x 512MB matched pair and bung em in banks A1 and A2 and not worry about it.
