this question has bugged me so far till now! i have gooled alot and find that yes you can.
q: can i use 800 and 667 ram on mb which either supports 400 or 667mhz?
i wanna buy 800 one and put it into 400. i know you have discussed and and some guy said yes go for it! and i wanna go for it cuz its cheap plus in future i can take them off and put into new motherboard. what do you say. i am not going for 667 directly 800. now galaxy doesnt show corsair 800 rams (i like Corsair.) still i aint getting kingston whatever happens.
and btw can i get bigger rams than 800 and put them in 400 i know its toooo much but can i? I LOVE RAMS LOL