Upgrading the processor and graphics card in any iMac is not something that is typically done or possible, in most cases. In order to upgrade your processor you would need to replace the entire logic board, which cost a lot of money and not worth doing. You may be able to upgrade the video card but you would have to buy a video card from apple that would be compatible with your iMac and again it would be very expensive. If you provide your serial number I can give you a better idea what options there are and pricing. Hope this helps!