Hello,
I have an annoying issue when running SLI and playing games in MST mode. When using the mouse, panning views feels very choppy and stuttery. Moving around with the keyboard or a gamepad results in smooth motion. The mouse panning issue goes away when I switch to SST, despite being locked to 30 Hz in UHD resolution. I have a link to a video from a user in a couple of tech forums that document this issue fairly well.
(Please visit the site to view this video)
Now I am wondering: could it possibly a MST monitor issue or a display driver one? I am hoping others with the same set up or another 4K display monitor can chime in.