Use USB 3.0 without extra molex adapter?

Does anyone know if the USB 3.0 add-in cards will work if I don't connect a molex adapter? I'm trying to add one to a server build that does not have any way to add a 4-pin molex. The hard drives I would be attaching have their own power supplies, so I don't think I need the extra power to be supplied via USB.

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More about extra molex adapter
  1. I think it all depends on how the add in card is passing ground along. If its from the pci/pcie slot then I think it would work but if its from the molex then you probably would wind up with a poor quality signals on the data lines which may affect speeds. You might have to refer to the manufacturer unless you want to do trial and error. Let us know how you make out.
  2. The molex connector does route +5V and +12V lines to the add-in card. So even though hard drives connected to it have their own power source, the add-in card might not be stable or even work at all.
  3. Thanks for the info. I'll give it a try with a spare external drive just in case.
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