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Amazon.com: ARCTIC P8 PWM PST - 80 mm Case Fan with PWM Sharing Technology ( PST), Pressure-optimised, Very quiet motor, Computer, Fan Speed: 200-3000 RPM - Black : Electronics
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ARCTIC F8 PWM PST CO - 80 mm PWM PST Case Fan for Continuous Operation | Cooler with PST-Port (PWM Sharing Technology) | Regulates RPM in sync - Newegg.com
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