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The card I bought is: Apple iMac A1311 A1312 ATI Radeon HD 5670 512MB Video Card 109-B98557-00. Chip is 216-0772003
I dont know where they got this card.
I want to put to iMac 2009 C2D where original card has 216-0729051 chip.
I just said that a 5670 can NEVER work in a C2D machine, case closed. Fix the original card or get a working 4670, which will die again cause they are all 10 years old now.
It will give an image but will have no thermal control and card will slowly cook itself. 5670 is not natively supported on 2011 models so it will not read the sensors on the card.
All cards can be swapped between 27" machines always. On 21" all can be swapped as long as it is not a C2D. Of course thermal control problem if card does not originally belong in the machine.