Can you provide some citations for this, please?
Citation 1
First time it resurfaced in a mainstream tech channel;
Practically, if you're CPU bound with a lowish end CPU, your theoritical maximum CPU bound performance is approximately %20-25 higher with an AMD GPU. Some believes this does not apply to high end CPUs. I don't know about that.
Considering a 4790k is not that far away from a 3600/2700x in terms of pure gaming performance, I'd say 2700x/3600 is being highly affected of it.
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This post is also useful to see its potential effect on 2700x, the CPU that is constantly being compared to PS5.
For example, 2700x bottlenecks around 79 framerate with a 3090, while bottlenecking around 96 FPS with a 6900xt.
FH4 is 124 vs 144 etc.
It all depends from game to game.
If you watch the 1st video by nerdtechgasm, it goes all the way back to GTX 700 series where hardware scheduler is removed from NV architecture cards to reduce power consumption compared to competing cards at the time. I think they stayed with that design, since it was not that useful to begin with. Then NV started using their own software scheduler, which actually is great for DX11 titles. It practically has the ability to make the code more "multi threaded" by design, without developer doing anything. As discussed in the video, it was the reason why some games actually did perform better on Nvidia in terms of CPU back in DX11 days.
DX12/Vulkan by design can make use of hardware schedulers, which AMD cards and consoles have. NVIDIA however kept using their software path, which practically adds the extra CPU cost that is being discussed above.
It is not a myth, or a lie, or a hyperbole. Its practically irrevelant if you're GPU bound. That's why it never was discussed a lot, since it never made sense that someone would pair a Ryzen 2600 with a 3060ti. Problematic parts where it starts to affect hardware is unbalanced combos such as that. Zen 2 is really better, maybe I was too harsh saying Zen 3 at a minimum. But Zen/Zen+ really feels horrible for Amplere, and even high end Turing products.
I think this thing may get traction once games get more CPU bound when we move into the nextgen. But maybe NVIDIA will re-add that hardware scheduler. We will see tomorrow