now i have searched these forums and found some posts about video cards in the 2006 mac pro, but none that really answered what i wanted to know. sorry if you've seen a lot of these threads lately. anyways, so i have the ati x1900, and i'm thinking about upgrading. looking at apple's site, they don't offer any options that will fit my mac pro. why is this? why won't it work with the gtx 285? or the gt 120 or hd 4870? now, if infact it would work with one of those, can i put more than one in my mac pro? i know the gtx285 uses 2 6-pin connectors or whatever, so i guess only one of those. but what about the others? can i put 2 in there? will they work without flashing or anything?