What is the sweet spot for RAM per core? Is it around 4GB?
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Depends a lot on what you're doing. Based on the assumption that it's related to suffering through Chromium builds, there's a baseline amount of memory required and then a lower amount for each added job. It helps a bit to have a ton of memory beyond that for caching though.
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amd.com/en/products/cp (32 core / 64 thread) is what I was planning on using for my new workstation build along with at least 128GB of memory.
I had trouble sourcing the parts for the overall build (particularly motherboard) in Canada and it got substantially delayed though...
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Yeah, but I wouldn't double the amount of memory if I was doing a build based on amd.com/en/products/cp (64 core / 128 thread). Most of the jobs won't even come close to 1GB.
It's more like you want ~32GB baseline, ~64GB+ for cache (ideally) and then maybe 0.5GB per CPU thread.
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Not much science involved in that estimate, just my feeling on it based on doing a huge amount of Chromium and AOSP builds on different hardware. I don't really expect that the cache helps as much as I hope since NVMe SSDs are so fast. It's largely just about the number of cores.
Think about how much time you waste waiting for builds, think about the value of your time and strongly consider getting a really nice Threadripper CPU. That's my feeling on it. I wish I could have put a new workstation together last year or earlier. AFAICT COVID screwed it up.
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Couldn't find anywhere to get the latest revision motherboards and didn't really want to get an older revision for the latest generation CPUs. Especially if I decided to go with the 64 core / 128 thread variant since the typical motherboards won't have good enough power supply.
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