![are all 3 pin fans running at (5v) and all 4 pin fans running at (12v)? If so, why is a 3 pin fan able to connect to a 4 pin header are all 3 pin fans running at (5v) and all 4 pin fans running at (12v)? If so, why is a 3 pin fan able to connect to a 4 pin header](https://preview.redd.it/are-all-3-pin-fans-running-at-5v-and-all-4-pin-fans-running-v0-eq5o5vbas70b1.jpeg?width=602&format=pjpg&auto=webp&s=06d61a3991e72f3b38f5ded69f5dcb36a52ab11d)
are all 3 pin fans running at (5v) and all 4 pin fans running at (12v)? If so, why is a 3 pin fan able to connect to a 4 pin header
![43000000 8in 12V PC Case Fan Power Adapter Cable, 3 Pin or 4 Pin PWM C – AMT | Computers & Electronics 43000000 8in 12V PC Case Fan Power Adapter Cable, 3 Pin or 4 Pin PWM C – AMT | Computers & Electronics](http://amt1st.com/cdn/shop/products/splitter_1200x1200.jpg?v=1586405321)
43000000 8in 12V PC Case Fan Power Adapter Cable, 3 Pin or 4 Pin PWM C – AMT | Computers & Electronics
![Amazon.com: PNGKNYOCN 4-Pin Molex Pass-Through to 5 x 3 Pin Fan Connector Cable (Power 5 Fans from 1 Molex Connection!) 2X12V / 1X7V / 2X5V for CPU PC Case Fan : Electronics Amazon.com: PNGKNYOCN 4-Pin Molex Pass-Through to 5 x 3 Pin Fan Connector Cable (Power 5 Fans from 1 Molex Connection!) 2X12V / 1X7V / 2X5V for CPU PC Case Fan : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61YvPl6pYML.jpg)
Amazon.com: PNGKNYOCN 4-Pin Molex Pass-Through to 5 x 3 Pin Fan Connector Cable (Power 5 Fans from 1 Molex Connection!) 2X12V / 1X7V / 2X5V for CPU PC Case Fan : Electronics
![4-Pin Molex to 3-Pin Fan Adapter Cable (CAB177) ModMyMods.com - PC Watercooling Parts and Accessories 4-Pin Molex to 3-Pin Fan Adapter Cable (CAB177) ModMyMods.com - PC Watercooling Parts and Accessories](https://modmymods.com/media/catalog/product/cache/1/image/300x/a86a6471cd126c7d06b2a398b3c8a4ae/4/-/4-pin_molex_to_3-pin_fan_adapter_cable__90269_zoom.jpg)