I use this machine as a console replacement and secondary gaming machine with a controller for ease of use. I already had one 7770 laying around from my rig upgrade. Originally I had some trouble with crossfire as the second GPU would run at 100% usage for no reason but found out it was partly from the GPUtweak monitor and disabling crossfire then re-enabling it then they worked fine. I used the ROG bridge from my machine because it looks cooler. In some games you could tell when the cpu was bottle-necking the system because i would have huge frame drops and see the cpu 100% load, games like Bf4 right after cut scenes and sometimes Planetside 2 but that game doesn't have good driver support anyway.