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A closed source $30 external network KVM is less expensive (and less featureful) than closed source onboard IPMI which typically increases board price by $100-$200.

I think there are some open source IPMI products, but that involves talking to an ODM about a run of thousands of boards which is a bit much for me; I just want two servers at home. I'm tempted by the Gigabyte MC12-LE0 boards that are low cost in Germany right now, but getting dedicated server boards disrupts my pattern of upgrade a desktop, and give the old board to my oldest server.