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Buying 3-4 $600 ssds instead of HDDs that cost about quarter of that is quite a bit difference.

Though I feel like it's cheaper and sufficient for most home use nas to buy some cheap phased out ddr4 to get let's say 128gb and let it cache things there, and the ram can be handy for other uses

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The real point isn’t about the literal cost savings with spinning drives, the point is that if you’re at a capacity level where the cost is becoming a factor that represents more than one evening out at your favorite restaurant, you’re at the point where a dedicated NAS solution is going to make sense for you.

And once you are at that point there is no sense in fussing around with setting up a “bespoke” solution like this that is a product of artificial constraints.

Disks are noisy. My FS lives in a room I need to be quiet. Disks are hot. I had hoped SSD would run cooler, they are hot but I find the room is perhaps a bit cooler now too.

Disks however, are much, much, much cheaper. Your ramcache point is well made.

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