I was wondering what the benefits would be for installing more than one HD 2600 XT in a mac pro? I know that you'd be able to hook up 3+ monitors, but what are the actual performance benefits? Are they significant? Are they quantifiable? Do they only affect certain applications or types of work? I don't intend to use Windows on this Mac Pro or to play games. I'll be doing strictly multimedia work (Final Cut Studio, After Effects, Avid Media Composer, etc). Hopefully they'll announce the HD 3870 today or tomorrow and I can add it to the stock HD 2600. That's partly why I'm inquiring.