I also wanted to add that I also had an issue when I added my sixth GPU. It couldn’t’ be recognized in Windows via USB riser. I am running VERS006S. What I did was take the GPU off of the riser and hook it up directly to the motherboard and attached the other five GPUs that were already recognized by Windows and it finally recognized the last GPU. I only log into my rig via Teamviewer and basically what happened was the RDP session flickered between resolutions for a few minutes and when it finally stopped, I checked the Device Manager. All six of my GPUs were under Display Adapters.
I haven’t taken the sixth GPU on the motherboard and attach it via USB riser yet, but I have a feeling that it will work out anyway. I am currently bouncing between 175MH/s and 180MH/s with EVGA Nvidia GeForce GTX 1070 FTW’s. I’m pulling about 980W at the wall…not bad for 6 OC GTX 1070 GPUs!