I just got the 39" model. Flashed to 50" firmware and just WOW. Amazing! I was able to set 2560/1440 @ 120hz. And 1920/1080 @120 hz. UFO tests state 60hz. RefreshrateMulti shows 120hz. Which one is correct?
I would be surprised if you could get 2560x1440@120Hz...
Just because the UFO browser test says its X FPS or X Hz its not always right.. Anyway UFO browser test has been known to detect the wrong refresh rate at time. Use fraps to verify the frame rate for the refreshrate multitool which has always been accurate for me on syncing with the display but I needed a third-party tool like fraps to verify what frame rate it was going at.
If its properly displaying it without dropping frames it will look like this:
If its dropping frames it looks like this: