so i've got a system with a fried c2d board. i can pick up a cd board for $150 plus shipping which is good for me. to find a comparable replacement, i'm looking at ~350 and i'm just not feelin that price as im on a budget. i'm not concerned about the speed decrease as im just trying to get this thing rebuilt. i understand that there are different heatsink assemblys..vertical vs horizontal. however, i do not know how to tell the difference and i am also unsure whether or not my c2d heatsink will work on this board i receive. the logicboard possess a t7300 c2d and model # is 820-2279-a, it appears. i cant find anything on that model, except for on ebay. and i totally cant find the serial number on this macbook. under the battery on the tray has no serial number listed, and i've read through this documentation http://docs.info.apple.com/article.html?artnum=303720. let me know if i can provide anymore information.