Hello, I upgraded my pc recently and also purchased an acer qhd display, 34" 3440x1440, I am experiencing some major lag on some of my old games, like metro last light and the witcher 3, I though I had a good enough set up to handle this monitor, I have the latest drivers installed for my gpu's, not sure what is causing this much lag, 20-30 fps on metro last light in action it goes down to 12fps, and the witcher is about the same, setting are set in high all across, I am stumped........ My specs are on my sig, thank you in advance for any suggestions.

The only thing I have overclocked is the cpu, but its simple OC , Monitor is coneected via hdmi 2.0

Maybe not enough V-RAM to push the 4k res?

upgrade your cables to displayport 1.2 for the higher rate I had a lg 34uc97-s that I sent back and using anything less than 1.2 for displayport or 2.0 hdmi drop the fromes which is the hz
 
sound quit working on my displayport on monitor lg tried to blame my card lol
  if came with the cables then use them

Now I just need to see if there is some kind of driver hack that will allow me to run free sync with the titan x.

Yes you are correct, hence the title qhd