How does Blender take advantage of normal RAM vs GPU VRAM? I tried searching but could not find a definitive answer on blender stackexchange.
I'm looking to upgrade a rendering Rig, and the RAM is a bit old... I know for most of my work I use cycles which relies on the GPU for rendering.
My question is that, Is there any benefit to upgrading the normal RAM i use? e.g. If I have 16 GB of 2000 mhz ram, is it worth to go to 32 GB of 4000 mhz ram?  Does blender only care about amount (GB) or does it take advantage of the Mhz as well?  I've read the Mhz are useful for high intensity gaming, but what about blender usage?
Does it make sense to leave normal RAM by the wayside and focus all cash towards buying an expensive and powerful GPU with the most VRAM ?
There's a setup procedure that happens when you render (subdiv/displacement, BVH calculation, etc) that is heavily CPU bound and uses system memory until it settles on the final scene data which is then copied over to the rendering device.  There's a balance to be struck.