I received my new iMac as a replacement for my 2008 24 iMac that went through 4 GPUs in 90 days. I went to software update to get the new graphics update, and holy balls, it didn't ship with the 10.6.4 update for imac 2010 models! What kind of performance gains should I see? I've noticed this system takes longer to boot than my 2008 iMac did when it was brand new, and other little quirks... Anyone have a simliar experience?