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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 ?

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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.

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RAM matters with ( in my experience ) with regards to simulations. For rendering the biggest bottleneck ( and in many cases direct crashes ) is VRAM. I would look into getting video cards with the most VRAM you can justify paying for. 8GB or higher ( ideally 12+ GB ) for heavy high poly count sims. I am on 64GB of RAM and heavy fluid sims are no go as my dual card system is 2x 4GB VRAM cards. I am hoping to get a 3090 to have 24GB of VRAM to solve this issue.

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