I just bought a HB271HK and the picture isn't quite right. There are ~1/3" black bars on the top of the screen and on both sides. The image touches the bottom of the screen properly. I've tried looking through the Nvidia control panel for the image scaling settings but both the X and Y axis are already at 100%. I also talked to Acer phone support and the guy took 45 minutes to tell me to try switching Wide Mode to Full (it already was) and then to just test with the other 4k capable gaming PC I obviously just have laying around my house. What else can I check?