Hey everybody, I just ordered a new 21.5 imac (3.06ghz) and it should show up tomorrow I ordered it with 8gb of ram pre-installed. Since it still had two open slots I ordered a 4gb kit from crucial since it was only another $100. My question is, I started reading that to really get the most out of the ram, they should all be matching. Is it going to matter that I have two 4gig sticks and two 2gig sticks or will it still give me the advantage because both sets are matching, just not in size? I always have a ton of programs, tabs, etc open so more ram is always a good thing, but if I won't see much of an improvement with the extra 4gigs I ordered from crucial I'd probably just return it. Thanks for the help!