Yes you CAN power a 12v PC fan via the GPIO 5v power headers : r/raspberry_pi
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Speed Control Fan DC 5V 4010/3007 3 Pin PWM Quiet Fan for Raspberry Pi
Pi4 12V fan on 5V pins - Raspberry Pi Forums
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How to run 12v Dc Fan with mobile charger, run 12v fan on 5v usb - YouTube
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Re: 12v fan on 5v supply? - NETGEAR Communities
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Controlling 12V PWM fan using 5V arduino with potentiometer - Project Guidance - Arduino Forum
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