I have a 980pro and 1080ti that I use for rendering. On Windows 10 there are no issues, however I get an issue on Linux after an hour of two of use.
Almost randomly after an hour (under little activity other than browsing), the screen will go black (linux crashes) and the GPU fans are running at full speed. I can reset the computer without issue, but the problem happens again after an hour or so. The issue does not happen if I only have the 1080ti active, and remove the 980pro from the motherboard.
Fedora 28 - Linux 4.16.8
850watt platinum psu
(non sli) 980pro and 1080ti with the later primary with screen out
x470 Gaming 7
nvidia-bug-report.log.gz (126 KB)