Please search before you post something that has been posted several times already.
MRoogle is quite a good tool to search these forums.
http://www.google.com/cse?cx=011016...e:forums.macrumors.com&hl=en&as_qdr=all&meta=
I was wanting to add 4 more gb of ram to my stock 27" i5. Who has the best price for it, and what type do i need to buy? Thanks
http://www.crucial.com/store/listparts.aspx?model=iMac%202.66GHz%20Quad-Core%20Intel%20Core%20i5%20%2827-inch%20-%20DDR3%29%20Late%202009&pl=Apple&cat=
http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=9C792650A5CA7304
http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=DFD4A74FA5CA7304
For most things there will be no improvement.What type of improvements will I see by adding two more (2x2) sticks?
If I get 4 gigs in my iMac, how is it in? Just a 4 gig stick? Or is it something stupid like two 2 gig sticks?