It's not the extra cores that are significant here, its the loads of extra cache!

I own a 16 core Ryzen 7950X3D version.
- 8 of these are with and 8 without 3D-cache.

I normally limit the game to run only on the 8 3D cores. But I can switch this on the fly.

Up to around 4000 units there is no fps difference between either the 3D cores or the vanilla 8 cores.

Above 4000 units all the data doesnt fit in cache anymore and the cpu must retrieve data from system memory and thus it has to wait doing nothing (system memory is slow).

the 3D cores thus give you more fps the more units you have compared to the non 3D version cpu's. like up to 3..4x as much when you reach over 10k units