I have two 512 sticks of Corsair DDR400 in my system running in dual channel. My friend just gave my two more stick of Kinston Hyper X DDR 400 (they were dual channel in his old system). I can't seem to run dual channel with all four sticks in. Is it possible to do with BIOS settings? If not, would I be better off with running dual channel on the Corsair (1gig) or should I use the four sticks without dual giving me 2 gig? Thanks.