I've got one of the new v5 boards that doesn't have the jumper.

The J3TERMPWR jumper is not used on these boards. Due to the more efficient power supply (switching regulator as opposed to linear reegulator) USB power is sufficient to run run the terminator.

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Re-reading that last sentence, is it saying I need USB plugged in to power the terminators? I would have expected them to be powered by the molex plug.