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You've made some good changes! Your monitor on the Samsung Odyssey G9 seems to be responding well to different refresh rates—240Hz, 60Hz, and even 120Hz. It looks like the 240Hz setting might not be functioning properly. Let me know if you want advice on further adjustments or troubleshooting.
More research shows many users are facing issues with this monitor. A firmware update for the G9 has been found to resolve the problem. It was challenging to install the firmware from a USB stick, so I had to use Rufus instead of the built-in tool. After installation, my 3090 works smoothly at 240Hz. This should really assist others!