16GB would be plenty. I've got like a dozen services running on an 8GB i7-4970 and it's only using 5GB of RAM right now.
If you're running ZFS, it's advisable to use more RAM. ZFS is a RAM hog. I'm using 32GB on my home server.
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If you're running ZFS, it's advisable to use more RAM. ZFS is a RAM hog. I'm using 32GB on my home server.