We spent a week with the ASRock Z87 Extreme6/ac before beginning our performance testing, running various configurations and CPUs and checking hardware compatibility. We verified our power consumption numbers using different power supplies and played a few hours of games with some members of the TPU community to get an overall feel for the board and to verify stability. Once completed, we tore down the system, mounted our CoolerMaster cooler, and put the board through the paces. I will, as with other recent reviews of mine, let the numbers do the talking.
SuperPi
WinRAR & wPrime
AIDA64
CineBench & HandBrake Encoding