HOLY. F#CK.
with all the settings set to ultra on overwatch, with vsync on (so liimited to 60fps) at 1080p, both gpu's on my gtx 690 are about 50%!!!!!
i've got everything set to the highest settings on that game and i'm only using 50% of the card! OMG!!
by the way, i tested it on my core i5 7400 system with 16gb ram, because i didn't want my low clocked xeon system to bottleneck it.