It's no big secret that today Apple announced that the ATI 4870 will be available sometime in the near future for the new Mac Pros and some of the other recent models. So the question is for those of us who are running a single 3870, is it worth dropping it for the 4870 or better to go 2x3870 in crossfire. This is more of a question geared towards Windows usage and not OSX since OSX doesn't support crossfire. Just a couple of weeks ago I purchased the Mac/PC edition of the 3870 from OWC and added the Accelero passive cooler to it and it's working out well. I was thinking about buying an additional 3870 to crossfire sometime in the relatively near future solely for the purpose of Windows gaming since you can get PC versions of the 3870 for so cheap. I'm guessing the Mac edition of the 4870 is going to be pricey so would the dual 3870 option make more sense?