power supply fan

[cognag05]

i noticed my psu fan running a bit fast during boot up, which makes loud noise... but when the computer enters windows (im using windows 7 ultimate 32 bit) the psu fan slows down and those mixer noise like is gone.. i checked and i confirmed the noise came from the psu fan.. can anyone help me with this?

 

[Veedaz]

Hi cognag05 & welcome to Windows 7 Forums
Many power supplies have a automatic thermal control of the power supply fan: they reduce or increase its speed based on internal temperature without any intervention required by the rest of the system.

 

[cognag05]

thank you for the fast reply .
so it is normal for a psu fan to run a bit fast during boot up even if the computer has been shut down for the whole night (the temperature i believe is not high at all) and back to normal speed when it enters windows?

 

[Veedaz]

Yes many do on boot, depending on the Motherboard the CPU fan can and on some PCs case fans can, if your concerned about your PSU fan i would monitor (watch and listen) to it over a few days

 

[cognag05]

thank you
guess it solves my problem

 

[Veedaz]

Good , You may like to know some PSUs (eg Enermax here > http://www.enermax.co.uk/products/power-supply/revolution85.html) have a fetcher that the PSU fans run on for up to 60 seconds after system shut down to help cool the system.