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    This is being flagged as off-topic as a hardware shopping recommendation. I don't agree; the question is whether ANY such motherboards exist, and I think that's a worthwhile question.
    – ChrisInEdmonton
    Commented Oct 9, 2015 at 15:32
  • I think you will find that this is usually abstracted away from the motherboard itself. The motherboard had standard connectors that go to some sort of multiplexer and that has the two power supplies on it.
    – Mark Henderson
    Commented Oct 9, 2015 at 17:36
  • For example, this
    – Mark Henderson
    Commented Oct 9, 2015 at 17:44
  • Right as I said because its abstracted away from the motherboard you need to use PSUs compatible with that dual PSU carriage. That's why I was asking if there are motherboards that do this all on board. Do redundant PSU carriages conform to some standard? Can I use replacement PSUs for one carriage in a different one or are the always proprietary? The ones I have seen look proprietary.
    – user1028270
    Commented Oct 14, 2015 at 13:46