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Amazon.com: Bewinner 4-Pin PWM Fan Hub, 4-pin Male for CPU Fan PC Fans Hub, Computer CPU/Case Fan Power Multi Splitter Connector Cable Adapter for 12V Computer 3 -pin 4-pin Fans : Electronics
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DELL fans use a different pin-layout than normal fans, so watch out before connecting them! « The Wiert Corner – irregular stream of stuff
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1pc 4 Pin To 3 Pin Fan Power Cable Adapter Connector 12v*2 / 5v*2 Computer Cooling Fan Cables For Cpu Pc Case 12.5cm - Pc Hardware Cables & Adapters - AliExpress
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1Pcs 4-Pin Molex to 3-Pin Fan Cable Adapter Connector Computer Cooling Fan Cables 12V/5V DC for CPU PC Case Fan - Walmart.com
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120mm Case Fan 120x120x25mm 12cm Computer PC Fan DC 12V 2Wire 3Pin Connector Cooling Fan 1600RPM 2-Pack
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Amazon.com: FFB0412SHN-F00 40 x 40 x 28mm Cooling Fan, 24 CFM, 51.5 dBA, 13000 RPM, 0.60A, 3 pin Tach connector. Ship from USA !! : Electronics
![3 pin fans: What are the voltages used by the tacho (speed) line? | AnandTech Forums: Technology, Hardware, Software, and Deals 3 pin fans: What are the voltages used by the tacho (speed) line? | AnandTech Forums: Technology, Hardware, Software, and Deals](https://forum.level1techs.com/uploads/default/original/3X/c/f/cf50e545602e40caaeebaa34d0a9ada6a8b9e720.jpg)