Can you point to some independent comparisons that provide support for the "superb quality" statement for RTX GPUs vs x264? The reason I'm asking is that's not

Can you point to some independent comparisons that provide support for the "superb quality" statement for RTX GPUs vs x264? The reason I'm asking is that's not what I expect from my experience. The main issue here is the CPU necessary to get equivalent quality x264 encoding? I would expect x264 medium profile to be better quality than any (consumer) hardware solution and I can do x264 1080@30 medium encoding in real time using ~70% of my old 5820k CPU. A modern Ryzen (3600 or higher) would use even less CPU so really not an issue, for a single stream (but it seems Nvidia has artificial limits to the number of concurrent streams anyway).