The graphics card is either a small custom card attached to the motherboard or a chipset built onto the motherboard itself. These are generally not replaceable with anything else either way as they are designed specifically for the imac itself. If by chance there was a card to replace it, apple would probably charge you several hundred dollars to get it done.
The graphics card is either a small custom card attached to the motherboard or a chipset built onto the motherboard itself. These are generally not replaceable with anything else either way as they are designed specifically for the imac itself. If by chance there was a card to replace it, apple would probably charge you several hundred dollars to get it done.
The graphics processor, to the best of my knowledge, in all 2006 iMacs with the Radeon chip is soldered onto the logic board, so if yours is defective, the entire logic board would need to be replaced. You'll need to get confirmation of the problem and a quote for the repair from an Apple Store or authorized Apple service center. I can only guess as to cost, but if you do indeed need the logic board replaced, you're going to spend several hundred dollars. You'll have to decide whether it will be worth the cost to get a five-year-old system repaired.
That would be the mid-2007 iMacs for the Radeon 2600. iMacs have never had the GeForce 8600, though the Early 2008 24" iMac had the 8800 GS. As to the Mac Pro, again, none has ever had the GeForce 8600, but the original Mac Pro up through the Early 2008 model was available with the 8800 GT.
If you want to know more, the specs on all Mac models going back years can be found here:
