That Motherboard supports dual channel RAM, so in order to take advantage of that you need to populate the slots in multiples of 2. Three sticks will throw you into single channel mode and cause possible performance degradation.
Thanks for the response. I will go with 2 pair of 2gig ea sticks, 8 total. 2 now and 2 more later as funds increase. We do alot of video and music editing using Sony vegas 7. More mem is helpful. I know its not the greatest board but I'm stuck with a 300 bucks limit :P