Fan Accessories: 3-Speed Fan Cable

The 3-speed fan cable has been included to give the installer maximum flexibility in terms of how the fan is connected inside the PC, and at what speed (therefore noise level) it is operated. Fitting this cable is EASY - it just looks complicated!

Diagram of the 3-Speed Quiet PC Fan Cable. The image shows a 4-pin Molex PSU connector, and wires to three color-coded 3-pin male sockets (this part of the cable is 90mm long). Each of the 3-pin fan power sockets has an associated RPM-monitoring cable (which is 300mm long) with a 3-pin mother board female connector on the end of it.

OPTION 1: The 3-speed cable can be left unused, and the fan can be plugged directly into the motherboard (onto a 3-pin male fan header) to run normally at 12VDC (full speed). The fan's speed (RPM) can then be monitored via the motherboard.

OPTION 2: Use the 3-speed fan cable to power the fan from a 4-pin Molex connector from the PC's Power Supply Unit (PSU). The 3-speed cable can then be used to run the fan at 3 different noise levels/speeds:

Speed	Noise Level	Voltage	Plug the AcoustiFan™ into:
Full	Very Quiet	12VDC	Black 3-pin male socket
Medium	Ultra-Quiet	Approx. 7.5VDC	Blue 3-pin male socket
Low	Virtually Silent	5VDC	White 3-pin male socket

If RPM-monitoring is required, then use the same color 3-pin female connector, and plug this onto the motherboard 3-pin header (male). The motherboard will be able to detect the speed signal from the fan.

For more information about monitoring fan speeds, see this FAQ.

Using the BLUE 7.5VDC Connector with High Wattage PC Fans

ONLY use the 7.5VDC (Blue) connector to power PC fans rated up to 4W (that is, a maximum of 12VDC & 0.33A). The resistor will become too warm when used with higher rated wattage fans. This limitation does not relate to the 5VDC and 12VDC connectors (White and Black), as these do not have an in-line resistor.

The majority of 'quiet' PC fans available are rated below 2W, so this is only an issue with higher than normal wattage fans. Should you choose to use the 7.5VDC speed option with fans rated over 4W, then please do so only on the understanding that this is at the installer's own risk.

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