I’ve had quality issues with NVENC on OBS at 4K that went away if I either used cpu encoding in OBS or used NVENC with Shadowplay. I don’t know what caused this

I’ve had quality issues with NVENC on OBS at 4K that went away if I either used cpu encoding in OBS or used NVENC with Shadowplay. I don’t know what caused this (I have a 1080) but it was super frustrating