By using the GPU-Z Board Power data in conjunction with the 11-game average FPS data we presented earlier in this review, we can work out performance per Watt for each graphics card. This is presented as FPS per Watt.
As a result of the significant increase to the power limit (+23% compared to reference), the Gaming OC is less efficient when compared to both the Founders Edition and the Gaming X Trio. The latter card offers 13% better performance per Watt.