Re: GTX680 4GB FTW:
I just got a replacement LG 31MU97 monitor from LG (old one had too much backlight bleed).
It was working great, but the order of monitors was not how I wanted it.. my main LP 3065, my InFocus projector to the right and the LG last at far right. I wanted the LG in the middle, so I dragged the icon and arranged it the way I wanted. A requester popped up asking if I want to keep the changes, which I clicked Yes. All displays blanked for a second and when they came back on, the LG display was complaining that it was only running at 3840x2160 and had two black bars down the sides. I went to change it, but the highest available resolution was only 3840 under the custom menu in the nVidia driver.
I created a custom 4096 resolution, which gave back the full resolution, but now the refresh is 50Hz and Premiere CS6 can no longer display video without dropping over 100 frames every ten seconds. It's stuttering badly and can't play video in a meaningful way now. Before I swapped the monitor order, I was playing 4K video with no dropped frames. Now the system cannot even play 1080 video without dropping 40% of the frames. If I turn off the monitor, the stuttering goes away. I rebooted and I still have the problem.
I tried to create a custom 60Hz setting, but the system won't add it to the list of custom resolutions now.
What the heck did I break when I rearranged the monitor order??