Imac graphics card

nope, they are just like laptops, only in a desktop stand and no battery. all the vid card's hardware is part of the mobo.
 
Actually, the new iMac has a removable slot if you can get to it. There aren't any commericial cards that fit the slot and work with OSX, yet, but there's a very good chance there will be.
 
Only the 24-inch iMac has a removable vid card.
The 17 and 20-inch cannot be upgraded, although the 20-inch can be ordered with more vid memory at the time of purchase. It cannot be upgraded at a later time.
Even with a possibly-upgradeable vid card, replacement would be quite challenging, requiring complete disassembly of the iMac. There's no simple plug-in slot.
 
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