Hi Guys,
Multi GPU with X99 and Windows 10 seems solved using Nvidia Driver 399.07.
Let me know if you have solved too by updating the Nvidia drivers.
https://render.otoy.com/forum/viewtopic.php?f=9&t=67801&start=10#p344836
https://render.otoy.com/forum/viewtopic.php?f=9&t=68650
https://render.otoy.com/forum/viewtopic.php?f=9&t=67801&start=10#p345364
Regards
Paride