I finally managed to get my 6x MSI 1070 to show up in Windows.
Now when i start the miner i only get 15 Mh/s in total of 6 cards. Before i did it with 3 Cards same type i was around 90 Mh/s.
I am using the nvidia Driver 368.81 the newest did not work for me.For the Mobo i intsalled newest Bios and activatet 4g/mining and put Gen0 and Gen1 to 1
FInally i manged it holy cow that was a crazy week to figure stuff out
Iam running now latest driver from nvidia normal Windows 10 64 bit No creators update.
I have now around 186.3 Mh/s and 63-65 Powerconsumption.
The problem was to have all cards pluged in and have to boot Windows,
then fresh install of GPU Driver all Cards pluged in and finally all 6 Cards showing up in Device Manager, MSI Afterburner, and the Miner.