I have a high-DPI display (13" 3200x1800) and figured that if I set it at 1600x900 (exactly 1/4 native - 1/2 width and 1/2 height) then each pixel outputted should be represented by a 2x2 block of actual pixels on the display, crisp and clear as if it was natively a 1600x900 display.
When I try it though, the image is very blurry. So I have two questions. Firstly, is it the display or the GPU responsible for adding this blur (or impossible to say)? And secondly, is there anything that can be done to prevent it?
I'm also looking at buying a high-DPI external display (24" 4K) so the question could also apply to that (attached to either a GTX 970 or Intel Iris 540).