That is some beast you got. I will leave the brief settings below this reply.
The rule of thumb is quite standard, go to your settings:
In Video tab,
- set the Base (Canvas) resolution to your screen sizes, if this degrade your performance, you can lower the base resolution.
- If you have intention to save some bandwidth or your performance degrade, lower the output resolutions by half of your base resolutions
for ex.: Base resolution 1920x1080, then output resolution 1280x720
Set the FPS to Common FPS Values, and set the FPS value based on your preferences.
For ex, for Gaming, use 60 fps, for basic things, use 30fps.
In Output tab (this is important)
For the sake of quick setup, just use simple mode on the Output Mode.
Video bitrate is also personal preference, but you can use
this guide. The higher the number, the cleaner the footage, and more bandwidth you use.
In my setup, I'm streaming on 2K resolutions (no downscale), my video bitrate is set to 16000 kbps. I have no problem with bandwidth.
Audio bitrate. The standard is 128, I use 160.
In Audio Tab,
Sample Rate. 44 kHz is standard, 48 kHz is what I use.
In Advanced Tab,
Set Process Priority to Normal. I used High because my setup is not for gaming.
Usually settings "somewhere in between" is still good for streaming.
Please feel free to ask.