ultrawide monitors

I have a Samsung G9 and 2 hackintoshs. A Mac OS Catalina and a Mac OS Big Sur 11.4. I can only get 5120x1440 with Picture in Picture Mode. With 2 cables. Has anyone been able to get max native res with only one? Thank you very much.

Hello, I have a NUC8i3BEH with 2 SSD crucial + x2 RAM Crucial 2400MHZ DDR4, When i wake up my hackintosh he do this bug/flash every 2 seconds. And if i unplug HDMI to another display i have the same bug with a blackscreen and whiteNoise. See the vidéo uploaded on ultrawide (2560x1080) ...

Hello, I recently installed macOS Sierra (10.12.3) on my desktop computer. My monitor has a native resolution of 3440x1440, except despite my best efforts, I can't get the OS to recognize/use it. I've tried posts like this one (the effects of which are still in place btw) as well as SwitchResX...

2 older systems using DFI Bloodiron EO 35 and Gigabyte EP 45- both boot 10.9 (no updates) The Monitor: LG 25UM64 Ultrawide display - 2 HDMI, 1 DP -Display port, 1 DVI-D port. Monitor keeps asking for 2560 x 1080 - do it but the text is not crisp. 8800GTS, OSX Preferences display choices...