- Connect multiple 3-pin fans to one 4-pin connector from the PSU
- Can also be used to reduce fan speed & noise This clever cable solves two problems in one. At its simplest level the cable means that you can connect multiple 3-pin fans or Fan Mates to one 4-pin connector from the PSU. This is useful where you wish to install one or more 3-pin fans but there are no available 3-pin fan header sockets available on the motherboard. In addition it gives you a choice of two operating speeds for your fans by allowing you to run your 12 volt fans at 5 volts if desired. This has the effect of slightly reducing the speed of the fan & significantly reducing the noise. Although the airflow will be reduced this rarely has a large effect on case temperature.