Games not seeing custom resolution

[spacehamster]

Hello. i bought a GTX 1070 strix and i have 2 monitors.  Hp L1940T (1280 x 1024 60hz)  and MNT DiGITAl19W  (1440 x 900 60hz) i put i custom resolution on the 900p monitor of 1920 x 1080 60hz . i had a XFX r7 260x Core edition before the upgrade and it ran it fine same timings res and hz. i have tried the presets GFT DMT CVT CVT reduced blanking. and the monitor runs it and windows see's it. but in most games  GTA 5  Far Cry 2 Deus ex human rev. but in fortnite doom quke 3 arena Minecraft  world of warcraft. lol planet coaster. dolphin emulator cirta emulator and many more only see the native resolution of 1440 x 900 60HZ . is there a fix or should i buy new monitor which has 1080p native

[FloRolf]

Wtf, why would you even do this? This is honestly stupid. 

Pls go get at least a 1080p, better even a 1440p display for that 1070.

What cpu are you using?