I have the GTX 660 2gb currently installed in my X51, looking online for stress tests and comparing it with the GTX 1060 6gb shows that power consumption is actually less (GTX 660 = 292 Watts @ 1080p gaming & GTX 1060 = 143 Watts @ 2160p gaming max. OC) does anybody know would this actually be true in practice? I just find it quite hard to believe the efficiency would be that good for a substantialy better card.