I just bought three of these displays from Best Buy at $350 each. I noticed while in surround mode(Nvidia) I can only run as high as 120hz. If I take them out of surround I can run each at 144hz alone. I then tried pairing just two together in surround and I got two to run at 144hz together but one would not do it. So I looked at the serial #'s etc. and noticed the two that will run together at 144hz are both Rev. 07 manufactured September 2017 and the one that will not run at 144hz in surround is a Rev 04 manufactured July 2017. So I guess something is different in a Rev 04 and Dell fixed it in either Rev 05, 06 or 07. Anyone else have this issue ? I am an iRacer and only use my pc for that. What I find odd is another iRacer had this same issue and he also has one Rev 04 and two Rev 07 and guess what...yep..his Rev 04 won't do 144hz in surround. *** Dell ??!!