The 5 pin is thermal-takes proprietary connector that controls the fan speed, lighting and power for the fans. As far as controlling the RGB on the fans from your motherboard, as long as you have the correct connector I don't see why not.
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It might be a USB interface. But you would have to figure out the pinout as I would assume they would make it not default, hell they might have just exposed the JTAG there and not fucked with a USB chip. But again you would need something that can figure that out (bus pirate or the like, but that is just more $$ then just getting a new one, or a different fan controller that works for you).
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