I think that I know the answer, but would like to hear from others. Some site cough (9 to 5 mac) are stating that the PC version, which is about $130 less, is identical and as the same card. They are actually suggesting people buy from Amazon, complete with a link. It was my understanding that you were tied to the overpriced "mac version." They are suggesting that it is the same card. $319 works for me, $450 does not. I would like to hear from people who know the true answer. I would think that major mac sites would not state that it works, if it, umm does not. Thanks in advance. I will take my answer off of the air....
I've heard that you have to flash the regular one with a special Mac firmware. but I'm no expert on the subject.