So I think I managed to install the Crimson Drivers AMD put out today on a new Mac Pro with dual D700's in Windows 8.1.. Without using DDU (had the latest Bootcamp drivers installed) I ran just the installer by adding EnableFalcon=true in the InstallManager.cfg. It ran through the install but crashed as expected during the Display Driver part. This did however successfully add the new FirePro control panel interface. It crashes immediately when attempting to modify any settings. Following the guides posted in the 15.11 thread on this same forum I fiddled my way through the actual driver .inf file and added the strings with my hardware ID. I used Device Manager to update my cards.. My monitor flashed black quite a few times until inevitably my computer hung. Pulled the power plug, booted back up and low and behold I'm able to modify settings and use both cards as Crossfire from the new FirePro control panel. Was also able to overclock, use DSR, eyefinity, etc etc. The only feature currently not working is the ability to disable Crossfire.. but I'm okay with that for now. Experienced a huuuuge performance boost in both Witcher 3 and Fallout 4. Where before I had to run both games in Borderless Windowed mode with a single GPU to have any kind of playable FPS, I'm able to utilize both cards and run Fullscreen at 2560 x 1600 with everything basically Ultra with 60+ FPS. Fallout 4 performing perfectly, and Witcher 3 still needed some fiddling to get rid of flicker. Not having as much luck with AC Syndicate at this time, but it's still playable at lower resolutions, much more so then before. Anyone else playing around with this stuff? Have been googling for a while but haven't found any other threads on the usual forums.