Yeah memory bandwidth is one of the really unfortunate things about the consumer stuff. Even the 9950x/7950x, which are comfortably workstation-level in terms of compute, are bound by their 2 channel limits. The other day I was pricing out a basic Threadripper setup with a 7960x (not just for this reason but also for more PCIe lanes), and it would cost around $3000 -- somewhat out of my budget.

This is one of the reasons the "3D vcache" stuff with the giant L3 cache is so effective.