![]() Intel specification for a 4 pin fan connector Although this page is related to the 3 pin connector, the 4 pin reference document used the same pinout for the first three pins.The following picture of a 4 pin connector serves only as reference for the pinout numbering. Standard 4 pin fan header connector: 1 GND black 2 +12VDC yellow 3 TACH green 4 PWM blue. The 3 pin connector is recommended for carrierboard designs. So, in the end the fan can be plugged and is working. In order to assure compatibility with consumer PC market fans the connector itself was assembled 180° turned. Design Guide for ETXexpress Carrier Boards Rev.Unfortunately the pinout in the schematic of the following carrierboards and documents is wrong: (The 3 pin connector has been used, not the 4 pin connector) Fans andon-board fan headers are backwards compatible. 4-pin connectors areusually used by CPU fans with higher power consumption. 3-pin connectors are usually used for the smallerchassis fans with lower power consumption. Due to easy available fans on the consumer PC market the same connector has been used. Chassis and CPU fans may use either 3-pin or 4-pin powerconnectors. Woodpecker and Robin baseboards may implement a fan connector.
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