

40 series to 30 series was pretty tangible IMO (4090 gets something like 30-50% more perf in most tasks than 3090 Ti with the same TDP), in part thanks to the much higher L2 cache plus newer process node.
50 series was very poor though, probably because it’s the same process node.
OBS can use NVENC, though IIRC it needs to be built with support enabled, which may not be the case for all distros’ package managers.