Thread: System fan Has Failed - Boot Error
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Old 10-22-2013, 08:12 AM   #2
PsYcNeT
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It likely has a slot for a PWM (pulse-width modulation) fan, which has an extra pin connector (4 vs 3) that monitors fan speeds and the PWM output/input.

They are usually an extra 2-3 bucks over a 3 pin fan.
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