I think i did something wrong on SpeedFan

Well, i was trying to set the fan speed but i clicked "PWM" by Accident, it was default to 3 but i accidently set it to 0.75, i quickly switched it back. Will this affect me in any way(PC)?

And on a side note: What is PWM?
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More about wrong speedfan
  1. ^+1
    The thing you did, wouldn't have affected your PC in any manner, since you changed it back.
  2. Best answer selected by xAceOfSpades.
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