I also discovered that this is an issue of the sharpness setting of the display, (only 4K displays) if the setting is to scharp it will get blurry with a 1920 1080 input.
Just because it cant handle...

I have my VGA converter recieved today and i connected it, but it seems that the problem is still the same.
So the output is the same as with hdmi.
It keeps a problem in windows with my motherboard...

Ive tried all kinds of resolutions today but still the probleems seems to be inside windows itself, with my amd chipset 32 bit asus system, the other 64bit intel chipset is just fine.
But i found...

It seems i have also this problem with my new samsung 4k TV.
My other computer that is also connected (hdmi) to this TV is just fine, like it always whas.
Both are 1920-1080 resolution.
But my...