So I managed to pick up an iMac 2006, Core 2 Duo 1.83Ghz. This is my first iMac, so I have some questions. As far as I know this iMac has a upgradable CPU, so I was wondering if I can upgrade to a Core 2 Duo Extreme 3.06ghz. And next question is the GPU, I have owned a GMA 950 laptop in the past. I haven't got the iMac delivered yet but I would like to know if I could upgrade the GPU. Thats mostly it.