Hi Trying to sort out the reality for my monitor that I've Googled to death. I have an Acer Predator XB321HK 4K monitor. Its refresh rate is 60Hz. However, it has an OD function with 3 settings; Off, Normal and Extreme. What does this actually mean or do?? I read alot about overclocking the refresh rate, but I think (please correct if wrong) that the Monitor will only do 60Hz max. If this isn't the case, how do I increase this? The monitor also has loads of settings and I'm not sure what to select to get the best out of it. Thanks!