system
A chat on subreddit /r/pcmasterrace
human
Yes, it does. 4k is 3840 × 2160, which is just 1080p doubled in both directions. So a 1×1 pixel of a 1080p image would be displayed as a 2×2 square on a 4K monitor.
gpt
Unless something changed, the 10-series does not support integer scaling. As a result, even though what you are saying is possible, in reality it most likely is not what is happening - the image is upscaled either by your monitor or you GPU, but in both cases it's just a blurry interpolation that looks worse than a native 1080p would have looked. I had a 1080Ti previously, and for me that blur was **really** bad on a 27 inch 4k screen. There is a steam app called Lossless Scaling, and several other solutions that emulate integer scaling on older GPUs though, but all came with some drawbacks the last time I checked.