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I’m looking at buying a replacement graphics card for the above iMac. I’m finding the same graphics card for sale online with two different MPNs (manufacturer part numbers). Any reason one of those might not work? The MPNs are: 661-5315 631-1013 Thanks in advance! Ross
The 661-1013 is for a different system and has a different heat sink than what you require for your system. The correct part for your system is 661-5315 for the Radeon HD 4850 512 MB board
