According to GPU-Z, this feature isn't currently implemented on RDNA3:
View attachment 296490
I see, that is a shame. I've linked this same article to someone else while explaining the whole deal with scheduling earlier today, but you should read it too. It's good technical info to understand how draw call handling works:
Access tools, tutorials libraries, and code samples from Intel to optimize your games.
www.intel.com
A very common misconception is that AMD's graphics driver is more optimized and thus places a lower burden on the CPU, but that isn't what occurs. It's the approach that Nvidia chose that favors PCs with high spec CPUs with more room for improvement (i.e. widening their performance potential at the cost of higher CPU load) over ensuring a smoother experience at the low end. Many games that seem to perform inexplicably poorly in an Nvidia GPU with a low end CPU are actually experiencing an unusual situation where the graphics driver is fighting for resources with the game itself, while Radeon's conservative threading keeps the frame rate more consistent in that scenario. Recently this has also affected some games with unusually high CPU usage due to bugs and/or DRM, with similar behavior where the Radeon cards punch way above their usual weight.
Last that I've had a chance to play with this, the Radeon driver with the Radeon VII didn't use more than 6 CPU threads even in the most parallelized tests, but Nvidia's would load all 36 threads on the same processor.
Unfortunately it's not a setting you can choose and is intertwined with the driver code itself. Nvidia explains the different driver instancing models on this article:
docs.nvidia.com
I'm not a graphics programmer but I've spent a very long time poring over the documentation on this specific issue trying to understand it better, as I've always been very frustrated with Creation's performance on Radeon. I've come to the conclusion the engine is just very unfriendly to the way AMD elected to write their driver, which isn't bad, just different.
Oh well, as our Godd and Savior would say, "see that mountain? you can climb it, it just works, sixteen times the detail. thank you for listening to my ted talk and remember to buy Skyrim".
BTW checked out that thread, note that they're using a i7-9700K: it's essentially the one modernish processor you didn't want to use with a 4090 if you wanted to upkeep performance in this scenario. Having only 8 threads will really have it by the balls here, you could knock it down to the 4070 and they'd be getting the exact same fps with that CPU, I'm sure of it.
Creation also has a weird affinity for the Ryzen's 3D VCache for some reason. 7950X3D just demolishes even the 13900KS in this game.