http://www.tomshardware.com/reviews/msi-geforce-gtx-1080-ti-gaming-x-11g,5036-4.html
http://www.tomshardware.co.uk/aorus-gtx-1080-ti-xtreme-edition,review-33896-4.html

At the bottom of the page it shows the power drawn from pcie slot. Msi 1080ti only draws 0.7A max wheres Aorus draws 3.8A.