I have a 2007 macbook 2.1. I just some dropped in 4gb's of G Skill Ram (2 x2gb) and a Seagate Momentus XT 250gb 7200 (with the 4gb of SSD ) from newegg. Everything seems to running great so far, the computers temperature hasn't even seemed to change from the new hdd from the old 80gb 4200 stock drive. I do have one question though. I was under the impression that the macbook would only be able to recognize 3 gigs of the ram however the system profiler recognizes all 4. Any insight??