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What kind of card do you have? Hackintoshing has gotten a lot friendlier in the last few years. I upgraded a hackintosh I built for a friend from 10.6 to 10.8 and was pleasantly surprised by how everything "just worked" with minimal kext juggling.

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Gigabyte Radeon 6850. What'll happen is, you have to choose a specific framebuffer configuration to even boot. 2 of these work with my card, only one of which allows hardware acceleration to work right and allows both DVI ports to work.

The one that allows hardware accel on a single screen is actually the right one for the card. The hex editing is to change the display outputs to enable the second head.

I'm using an XFX 6870, two-headed, on my Hackintosh, and didn't have to edit anything. I'm pretty sure hardware acceleration is working, too.

Those are sufficiently different that you likely don't have the problem. The 6870 uses a different framebuffer personality than the 6850, and likely the fact that it's a different manufacturer might ameliorate the problem altogether.

Which hackintosh tools did you use? I used Unibeast/Multibeast.

Multibeast from CD. I don't think this is an install problem though, there's an absurdly large thread about this on insanelymac: http://www.insanelymac.com/forum/index.php?showtopic=273937

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