I recently upgraded my video to an HD4870 so I could game again in my windows boot. Just curious if having 2x 4870's would cause any problems in OSX, I wouldn't think that crossfire would work in OSX SL but I may be wrong. Don't mind if it would only work with windows. The only thing I see I would need would be a Y splitter for the PCIe power cables. If I have the two cards installed with the crossfire bridge and one monitor per card any issues there?