Yes it is possible to use 4850 graphic card but the problem that it is not possible to place it inside because 4670 is much smaller, but you can upgrade to 5670 and even to 6750 graphic card from imac 21,5 2011. In these case the size of these cards is the same.
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Yes, it is possible to use Radeon HD 4850 graphics card but the problem that it is not possible to fit it inside because 4670 is physically smaller and there just isn’t enough room for it and the larger heat sink. But, you can upgrade to Radeon 5670 and even to 6750 graphics card from a 2011 21.5” iMac. With these the size of these cards & heatsink is the same.
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The same situation with iMac 27 Core2Duo with Ati 4670 graphic card, but there you can use 4850, 5670 and 6750 and 6770 graphic card
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The same situation with 27” iMac Core2Duo which have the Radeon 4670 graphics card, there you can use these Radeon cards: 4850, 5670, 6750 and 6770.
Yes it is possible to use 4850 graphic card but the problem that it is not possible to place it inside because 4670 is much smaller, but you can upgrade to 5670 and even to 6750 graphic card from imac 21,5 2011. In these case the size of these cards is the same.
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The same situation with iMac 27 Core2Duo with Ati 4670 graphic card, but there you can use 4850, 5670 and 6750 and 6770 graphic card
Yes it is possible to use 4850 graphic card but the problem that it is not possible to place it inside because 4670 is much smaller, but you can upgrade to 5670 and even to 6750 graphic card from imac 21,5 2011. In these case the size of these cards is the same.