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Message: <blockquote data-quote="ckuta" data-source="post: 1136718" data-attributes="member: 177361"><a href="http://forums.macrumors.com/showthread.php?t=877441&highlight=4870" target="_blank">The Golden Guide to Flashing Graphic Cards - MacRumors Forums</a>mac can actually boot from pc cards but it turns out it is a conspiracy as once was said. there is a chuck missing from the firmware which prevents the cards from working to boot macs. mac cards work in windows because windows doesnt need that extra chuck in its firmware to initialize. they could add the info needed for the pc card to boot in a mac environment but they dont.in short, they like taking your money. follow the link and learn how to flash the firmware of your card to boot osx.</blockquote>