How important is PWM for a CPU fan?

The 4pin fan connector on my motherboard is no longer working, but I still have a spare 3pin connector that I can connect my 4pin CPU fan to. Will there be any significant issues doing this?
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More about important pwm cpu fan
  1. The fan will run full speed.
  2. Best answer
    You may see an increase in noise due to the fact that the fan will run at its maxium RPM at all times unless you can go into your bios and lower it to 7v or something.
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