ARCTIC P12 PWM PST – 120 mm Case Fan with PWM Sharing Technology – $9.99 + Free Shipping w/ Prime

https://www.amazon.com/gp/product/B081VPP24C/ – $9.99
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• OPTIMISED FOR STATIC PRESSURE: During the development of the new P12 PWM PST, special emphasis was placed on a focused airstream and thus a high static pressure
• 200 TO 1800 RPM REGULATED VIA PWM PST: Thanks to 4-pin connector, the RPM can be regulated in a broad spectrum via PWM, noise is kept at minimum while maximum cooling performance is given when needed