![]() There’s no need for you to manually connect any GPU Fans to the Motherboard or elsewhere. The female part of the Fan-Molex-Connector to the male connector of the PSU. Other fans come with both molex and all 3 or 4 wires in the 3 or 4 pin connector - you're supposed to use one of them, whichever is more convenient. GPU Fans of Open Air and Blower-Style Cooled GPUs are already plugged into the necessary fan headers on the Graphic Card’s PCB. connect a fourpin Molex connector from the power supply to the connector on the fan, as shown in Figure 341. Hi SushrutThakur, the molex connectors are to connect the fans directly to the PSU. Some fans come with a molex connector and the single sensor wire going to a 3 pin connector, basically just to make it possible to read the rotation speed. On 4pin wide fan headers, the 4th pin allows motherboards to tell fans to change rotation speed to a particular speed but if you plug a connector without that wire, the fan will simply run at 100% all the time and there's no problems. If any of the fans connect to the red wire on the 4-pin, thats usually 5v. You can plug this 3 pin connector in fan headers that are 2 pins, 3 pins or 4 pins wide, only the first 2 pins are a must, the 3rd and 4th are optional and fans will work if the wires for them are missing. You can determine this if the connections are made to the yellow wire on the 4-pin molex, thats usually 12v. The 3 pin connectors are basically : ground, 12v, sensor where sensor is an optional wire through which the fan sends to the motherboard the rotation speed (so that applications can show it and maybe shut down the system if the fan every fails, to protect components inside). The fans use 12v so often besides the 3 pin connector, fans also have wires going to the molex connector (just the 12v part of the molex connector) as an option in case your motherboard doesn't have enough 3 pin headers.
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