I recently bought a refurb 2008 imac with the 3.06 ghz and the 8800gs, my question is this....aside from the graphics card and the bigger hd and faster memory, what is the difference between the 2008 imac 3.06 and the 2009 3.06, the reason I ask is, why cant I put more than 4gb of ram in this computer everywhere I look says its the same chip and same mobo, so why the slower ram and the 4gb limit on it? sorry if this is a dead horse, so to speak, but i couldn't find a definitive answer anywhere online.....