I recently purchased two Sunon case fans that use the 3-pin adapter (which most cooling fans use, which are located on the motherboard itself) without knowing it.. Well, I knew that I got the fans, but I didn't know that they used a 3-pin adapter. Took it home and then realized it. Both of the connectors on the motherboard are taken up, though. Are there any adapter cords that can change a 4-pin thing to a 3-pin?