I try to gain some more FPS from my 2060 super card on a 21:9 screen.
I want to run 2560x1080p instead of the original 3440x1440p but the image gets pixelated in 1080p Fullscreen mode. This doesn’t happen in Windowed mode (using the whole screen)! Anyone knows why? See pics.
I don’t know, but I would stick to the monitor’s native resolution and reduce the Render Scaling slider to adjust for FPS.
Monitors only outputs what signals that are given to them. So if the signal only has fewer information in the form of pixels to output to a monitor with a higher output, it will fill the empty pixels with that one.
Think of it this way. If you run games on native resolution, each pixel is rendered to the monitor using one pixel. This one to one relationship makes the game look exactly what is designed for. so if a small area in a monitor of 2x2 pixels will be populated by 4 individual pixels from the signal.
Now use that same monitor, but this time the game renders it at just half the resolution, which will mean it only sends 1 pixel in the signal. The monitor has to draw 4 pixel area with only a signal that contains 1 pixel. So instead having each individual pixel in that 2x2 area to be populated with an accurate pixel, it only has 1 to work with and fills in the entire 2x2 with that one pixel.
Zoom it out to count for the entire screen, you’ll get a lot of pixelated images, because the monitor has to output a large number of pixels using a signal that doesn’t give it enough information to work with.
The reason why it doesn’t happen in windowed mode is because Windowed mode will always run at the resolution of your OS. So if your OS is running at the native 3440x1440p, the sim on windowed mode on full screen will run at 3440x1440p as that’s the signal your PC is sending to the monitor. On full screen mode, your PC overrides that signal to use the game’s lower resolution of 2560x1080p. Which as I explained above will make the monitor need to more pixels than what was given to it.
It’s always a bad idea to run games at anything outside of the monitor’s native resolution. If you need more FPS, reduce the quality settings. Play on High or Medium. Or use the GeForce experience to set the optimal settings, you should get the best balance between FPS and quality then.
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Makes sense. Thanks for the useful information 
Curious to what performance you were getting? Ultra on a 2060super on 1440p ultrawide is a no go.
I own the exact the same GPU on a 2560x1440 16.9 monitor and I can loose 10-15fps from 1080p to 1440p.I shall illustrate.I hope the 3080s will be back in stock.After all the 2060super is a 1080p card sitting with 2176 cuda cores it doesn’t have enough power for QHD at least in a flight simulator.What I have to do is mix Ultra on high on 1440p to win some performance back.
Ultra preset 1440p
Ultra preset 1080p
I can’t tell exactly the reason it gets pixelated, but fullscreen in MSFS is not true fullscreen. It is a borderless window. And I can only think the scaling of the rendered image with the engine they use, does not filter the image, at all… So the scaling is terribly bad when not using native resolution.
I tested this on my 49" 5120x1440 display early on to hopefully gain some performance while also upping the antialiasing quality - but ended up disappointed because of the pixelated image.
I use High most of the times and native resolution, and customize it with Ultra on buildings, windows among others and get about 40fps in most places. When in the cities I get around 15-25, depends on the amount of things there. I have a i7 9700k CPU which also does its work. No overclocking and CPU is about 70-80% and GPU around 80-90% most of the times.