I always wanted a large 4K monitor, so I had was also very pleased when he finally was in January this year with me. After a harrowing long test period, I returned the monitor. Due to the two internal halves monitor often turns off a monitor half. Or when you start the monitor is only half recognized. Excluding run the PC and only want to make the short-time monitor, he does not go back on. It remains only a complete restart of the PC and even then it is not always detected properly. In games such as one must sometimes turn to the desktop, and whoosh is half of the monitor off. Very strong this problem occurs when the connection of a second monitor any. But as I always 2 or 3 monitors work and play, the monitor is absolutely useless. I also have 8 and 8.1 reinstalled Windows. Have 290 tested the monitor with the GTX 780, and also with the R with the newest drivers weweils. With AMD and the 290, it's even worse than Nvidia. And I've tried and tried, because I wanted to keep the monitor necessarily really long, but it was not a day where I did not have to start the computer and repeatedly had me having trouble with the monitor. As long as the monitor is controlled with 2 panels it is useless if there is sometime a single actuation of the panels I buy this then certainly. I can only advise everyone to wait until these issues has been resolved.