Problems with LG 27GL850 and 1080TI games crashing
Problems with LG 27GL850 and 1080TI games crashing
It seems the issue might be with the power supply unit. The 1080ti works well at 1440p, but if monitors are switched on and the GPU needs more power, the PSU may fail to provide it, causing crashes. It could also be that the card isn't outdated, and no new games are optimized for higher performance cards yet. The best solution would be to replace the PSU and test it. This is just my assumption based on what you described.