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I'm thinking of building a new machine for my work, gaming and tinkering with VMs and I'm a little on budget. To keep the work part fast I want as fast RAM as possible, but they tend to be expensive. So I thought about having let's say 8GB of very fast and expensive RAM and then maybe 64GB of cheaper and slower ones.
Is there a way to make this work (on Linux, preferably)? Another problem is that motherboards in my price range don't support that much ram directly (and also 4GB sticks are the cheapest, so that would require even more slots.
What I was thinking about was getting a PCIe ram disk thingie, put the cheap ram into that and use it as swap with swappiness set to maximum. Is this feasible?