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Amazon.com: ZRM&E 4Pin 12V PWM Fan Hub Speed Controller SATA 1 to 10 Way PC Cooling Fan PCB Adapter CPU Cooler Power Splitter Socket with PWM Connection Cable : Electronics
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Quick Hack: Converting a computer fan from thermostatic to PWM control | Rip It Apart - Jason's electronics blog-thingy
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Computer Case Miner Fan Speed Controller 8 Port 4-Pin Fan Hub PWM High-Power Fan Controller Fan Speed Governor - AliExpress
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