Double the fan connectors in your computer with these Y splitter cables. With elaborate cooling setups it can sometimes be a pain to power all of the fans, with this cable you'll be able to double any fan header. Note: Only one 3-Pin male connector has a tachometer/speed wire. This is because motherboards/fan controllers cannot accurately read the fan speed when two speed signals are being given simultaneously. This cable is made correctly to avoid this problem, with only one tachometer wire on one of the male connectors.