that would depend on your OS.. XP only sees 4gig. anything more than that you just an exercise in futility.
Also, they have to ALL be matched pairs. Thats really quite important
well i'm running 7 ultimate, i already got the ram and put the new sticks in the 1st channel and put the older set in the 2nd, i saw that the older set was just sitting there doing nothing so i'v taking them out thanks for replying anyway