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I have a Mid-2010 Mac Pro, Single CPU, MC560LL/A. It's equipped with the Apple-provided Radeon 5770.

However, I have a Radeon 5870 from my old PC lying around. I know I can't directly use it, but I wonder if there's a way to flash it to work with the Mac?

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Yes you can. Netkas has a ROM at that link that works for 5870s.

You might also get by without flashing by going the Hackintosh route and adding some kexts

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Okay, Netkas is definitely the place to go. However, I learned that not all 5870 can be flashed (to support EFI in order to show a picture before the OS boots). Oh well, the card was lying around anyway, doesn't matter that it's bricked now. This thread is super helpful: forum.netkas.org/index.php?topic=692.0 - but really, if the ROM doesn't have 2 MCuC section after following the steps, it's not possible to add EFI. –  Michael Stum Sep 24 '11 at 4:20

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