4K monitor showing pixels when widescreen

If i was having that issue first thing id do is make sure the monitor is set to scale correctly in the control panel and on the monitor.

If that didn't work then maybe flash is doing it? try using the dreaded IE after installing the latest flash version for it.
 
Try reinstalling the drivers with a clean install, check the monitor image size settings in monitor setup. You could always reset the monitor to factory settings.
 
Reset monitor to factory settings, re-installed Nvidia drivers and still happening in Chrome and FF.

Will try IE now with the updated Flash player.
 
I have the same monitor,only had it a week, am using a 750 ti till my new card arrives,I havent noticed the problem your having, have you got a link to what your trying to watch?
 
The picture is fine for me no pixels or stretched,am using
Firefox with the DP cable that came with the monitor @ 3840 x 2160.
When that vid is in full screen, there are 2 black bars either said of the video about an inch either side but assume thats just the res of the video.
Sorry i couldn't help,all i can suggest is what others here have said about checking cable,try diff browser ect, gl anyway :)
 
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