Sorry to disapoint you but it is impossible to replace the videocard in the
imac.. Because the videocard is part of the motherboard. There is no pci slot for it... Sorry..
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En hoe weet je dat zo zeker? Zijn er geen externe videokaarten? Via FireWire ofzo? And how do you know that for sure? Aren't there extern videocards? Via FireWire or something?
Actually it is on a PCI bus, (just to follow the standards), but it isn't possible to change out the ATI chip unless you have the motherboard schematics and you're a hardware expert