Resolution only stretches at 60hz?

[soniizin]

Recently i found out that playing at fullscreen would give me better performance at games so decided to try it out.

The only game that i struggle with performance is Fortnite. So i wanted to use a 4:3 resolution stretched to get more performance along with fullscreen. If i set my monitor to 60 hz, the game opens up and stretches normally, since my monitor supports 75hz, i tried to use same resolution but with 75hz and when the game loads up it just changes the resolution to native and gives me a big black bar ( i can stretch it normally with 75hz on cs go for example ).

Is there a solution or is just how the game deals with it?
Thanks!

PC:
i5-3550 3.3GHZ
amd r7 360
Monitor:
Samsung SyncMaster T190

 

[t99]

Just curious why run in 4.3 vs 16.9? Is it some really old display? I have seen some refresh rates only available on certain resolutions, but not the aspect ratio not working like that. If you can try 16x9 and see what happens.

 

[soniizin]

I tested a couple 16:9 resolutions and most of them does not support 75hz. But 1366x768 supports it and actually did work in game.

I wanted to use 4:3 because i'm used to it and would get more performance. Not sure why 1366X768 worked tho, gonna test a couple 4:3 resolutions.

//edit

I tried a bit and it seems that if the resolution I test is bigger than 1024x768(with 75hz if supported), i get blackbars. For now i`ll stick with 1024x768 and test a bit more. I`ll leave thread open for a while and if no one has an explanation i`ll close.