Specs are in my signature and yes this is on Big Sur. It sometimes takes a while to launch but it does. Assuming you've got an AMD GPU as you've mentioned Big Sur change to my PAT patch rather than algrey's for better FPS in the game.
If your comfortable with using a custom kernel and creating the installer etc you can get the kernel files here, https://files.amd-osx.com/?dir=Kernels
There are kernels for Sierra there which might work.
To be honest it's more hassel than it's worth on an older system. You'd need to apply a patched kernel, and updates would break this. There isn't any bootloader patches for the older systems. Personally if I were to revive an old system like this I'd stick a Linux distro on it.
Hello users. I've added a new feature to see how it goes. Your can now upload an image into your forum post instead of attaching one. This will upload your image to the AMD OS X image host ( https://img.amd-osx.com )
To do so simply click the Upload image button along side the Attach files...
For use only on X570. Add to your OC EFI and include them within config.plist.
Remove any exsisting USB mapping before using.
This method allows my internal USB 2.0 hub to work correctly allowing control over NZXT RGB etc.