Hi,
I have 7 x Nvidia GTX 1070 with this motherboard and have it running with 6 fine (not overclocking yet).
I am using an M.2. SSD and have 5 cards and 6 USB risers on a 1000W PSU and 2 cards and the M.2. SSD on a 500W PSU.
Sometimes when I reboot one of the cards fails to load (in device manager):
Windows has stopped this device because it has reported problems. (Code 43)
If I disable / enable the device then it works again.
I have run Display Driver Uninstaller then re-installed the Nvidia drivers but this does not help.
I have swapped the USB cable riser around and used different 3d cards, the hardware is all fine.
Any advice?