AMD boards dont use faster RAM because they really dont need it, and the Intels are the only thing that really need the really fast DDR2 RAM. Thats what I understand.
I hear ya thou, when i was first looking at building a system I was gona go Intel because they can use such better RAM. But I kept hearing the AMDs dont need the fast expensive RAM and thats the reason they still use regular DDR. I think an AMD system with old DDR would be better then an Intel system with expensive DDR2 anyway.
I think the AMDs are finally getting to where they need the faster RAM thou, from what Iv heard thres something new for AMDs comming out called 'M2', I dont know if thats a motherboard or just like a new begining for AMD boards or what but I gues they will start supporting DDR2 RAM soon.