Ok, before I get yelled at, I did a search. Could not find an answer. Got the new 13 inch Mackbook (Oct'09 MC207LL/A) I know it takes DDR3-1066/DDR3 PC3-8500 204-pin SODIMM. So I did a search and found that many users are upgrading their 13 inch Macbook Pros (or any other 09 Macbook Pro, as I think they all take the same RAM?) Many pointed me to this: http://www.amazon.com/Crucial-CT2KIT25664BC1067-204-PIN-PC3-8500-SODIMM/dp/B001KUL012/ref=sr_1_1?ie=UTF8&s=electronics&qid=1259539184&sr=8-1 Which looks to be the same as this: http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=2E9B2B4EA5CA7304 But when I go thru the Crucial Memory Advisor Tool it gives me this: http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=18CAEA65A5CA7304 The "model" #s are different. CT898327 vs CT1115272 But what is the difference? Will the CT898327 on Amazon work with my Macbook? Or do I need the CT1115272? Thanks in Advance.