I have an Ubuntu 17.10 installation and I would like to connect two Nvidia GTX 1070 graphic cards and use the Nvidia official driver instead of the Nouveau drivers.
I have tested the following versions of the official drivers:
390.25
387.34
384.111
With each one I have no problems to boot up using a single graphics card, but with two I get stuck on the purple screen of death.
I tried to disable the purple screen so that I can diagnose the error, but I even failed at that.
I feel pretty much stuck in here, so any hints whatsoever are warmly welcome.
This answer describes what worked for me.
It turns out that the problem was maybe caused by me using a HDMI connected TV instead of a normal VGA monitor as a primary screen.
I changed the settings in BIOS to use VGA as primary output and connected the cable directly to the motherboard instead of the graphics card. Then I re-installed the system and everything is working now.