1080p scaled to 1440p might be playable but will be visually worse than 1080p native of the same size.
Of course 1440p is nicer if you have the GPU, but if you plan to render at 1080p you are better off with a 1080p monitor.
Can a 1080p run 1440p?
Now on a display that can output a maximum resolution of 1080p has about 2 million pixels while a 1440p display outputs 3.7 million. What it does is bring that 1440p resolution to your 1080p display and compresses it to fit inside the screen. The effect it has is similar to zooming out on a lower resolution picture.
Should I get a 1440p monitor or 1080p?
If your PC rig is too strong for 1080p, you should definitely invest in a 1440p display. 1920×1080 or Full HD is still considered as the standard resolution since most of the content out here is in 1080p. Moreover, it’s not very demanding and nowadays, 1080p displays are quite affordable.
How do I make my 1080p monitor look good on 1440p?
It won’t look as good as 1440p but it will greatly improve FPS because you are in a lower resolution. If you can afford it($250-$325), I recommend getting a 4k monitor. Then you can turn down settings to 1440p and 1080p for gaming and you’ll be able to watch video in 4k.
Does 1080p look worse on 4k?
Does it look worse to play at 1080p on a 4K or 1440p display than if you simply used a 1080p monitor instead? The answer is yes, it does look a bit worse (mostly it’s blurrier), but for many people it doesn’t matter that much.