Currently Online 
Hardware Unboxed: Nvidia has a driver overhead problem (in CPU-limited scenarios)
While I personally don't like Hardware Unboxed due to them being historically bias towards AMD, they do some tests once in a while that are interesting.
In CPU limited scenarios, especially at the low end, getting an AMD GPU would net you better performance, sometimes up to 20-30% better. Now this doesn't apply universally as we have seen with Several Direct X11 games, Nvidia does better even at the low end. And the tests that were shown, the game settings were set to medium. But if you do have a low end CPU like a 1600/2600 and you are playing at 1080p medium settings and it's a DX12/Vulkan game which most modern games are, an AMD GPU, both 5000/6000 series will be better than 2000/3000 series from Nvidia due to the Driver Overhead. As you increase the GPU load by playing games at ultra settings or with RT on and etc, that's where Nvidia's GPU perform like they are supposed to with low end cpus.
Hopefully Nvidia fixes it in the future because while this isn't a problem with mid-high end CPUs now, we all know that high end CPUs eventually become mid ranged and then low end. And if AMD did have an answer to DLSS and was competitive in Ray Tracing and 4k, then you would have a scenario where RDNA 2 might have been the better choice. For now though, if you have a low end CPU and you play at 1080p medium settings, it's better to get a 6000 series.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850
