I've got 2 x GTX970's running in SLI, I've tried tweaking NVidia control panel and am also using opengl (from here, thank you). I am also forcing UT via .ini file to run in 1920x1080.
What I'm finding is that when I'm turning to look around, the screen sometimes jumps around. I am also using a Logitech MX950 wireless mouse, if that makes any difference.
If you could let me know your views on this, I would appreciate it.