[zozbot234]

More cache has diminishing returns, because cache wants to be as close as possible to the core logic. And modern CPU's are mostly cache anyway. Special-purpose blocks for common compute tasks are quite cheap.

[xxs]

>And modern CPU's are mostly cache anyway.

Skylake is less than 30% cache. However internally it's 512bus, thanks to avx-512 - which could be considered suboptimal.