I get Nvidia 1070 display cards and Ubuntu 14.04.
After installing the printer driver(see http://www.nvidia.com/Download/driverResults.aspx/104284/en-us) for 2 1070 display cards, I could not login the Ubuntu desktop environment and the OS gets stuck in login loop by plugging the HDMI cable to the onboard display.
With 2 display cards, the monitor can show the OS by changing the HDMI cable from onboard display to one of the two display cards. And I can login the Ubuntu desktop environment.
With 4 display cards, however, the monitor CANNOT show anything again by plugging the HDMI cable to any one of the 4 display cards. The monitor can only show the OS by plugging the HDMI cable to onboard display this time. Also, I cannot login Ubuntu desktop environment and the OS gets stuck in login loop again.
How can I solve the problem. Can anyone give some some hints?