Lilu's userspace patching is not working on BigSur when using KernelCollections. Kext like AMDRyzenCPUPowerManagement.kext panic due to this.
Older versions of the kext (0.3.x) are reported to still work on Big Sur.
Thanks Shannee for this guide at the start. It made AMD Power management setting up easier. I did have an error earlier, when it went into Hibernate, and seemed like a USB error. Hopefully this fixes it. Hopfully next week I'll have a newer 6GB card to replace my GT 710.