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Miami Steve
06-04-2004, 04:00 PM
Hi,

When I go into the BIOS on my PC, there are 2 fan speed readings. One is for the CPU fan and displays around 2300 rpm (in blue), however the PSU fan speed is displayed as around 1400 rpm in red.

Is the colour relevant? Should I be concerned?

Asus P4P800 Deluxe mobo with Thermaltake 420W PSU.

Cheers
Miami

godfather
06-04-2004, 04:32 PM
1. Is the PSU fan even monitored by the motherboard/BIOS? Usually they are supplied directly from within the PSU itself.

2. Is the PSU fan (assuming it is monitored) compatable with the BIOS monitoring to allow correct reporting? Its red because its running slower than the BIOS "thinks" it should be.

3. Is the fan in the PSU temperature controlled? And therefore only runs full speed when its hot? The BIOS would not understand that.

Miami Steve
06-04-2004, 05:15 PM
> 1. Is the PSU fan even monitored by the
> motherboard/BIOS? Usually they are supplied directly
> from within the PSU itself.
>

I don't know. There was no manual or similar with the PSU.


> 2. Is the PSU fan (assuming it is monitored)
> compatable with the BIOS monitoring to allow correct
> reporting? Its red because its running slower than
> the BIOS "thinks" it should be.
>

Again, I guess it needs somebody who has a similar setup to be able to comment.


> 3. Is the fan in the PSU temperature controlled? And
> therefore only runs full speed when its hot? The BIOS
> would not understand that.

That's possible. All I know is the PSU is a Thermaltake 420W with Active PFC whatever that is - could be some fan intelligence???

Miami Steve
06-04-2004, 05:18 PM
As always, it pays to read the specs closely. You are correct GF. The fan speed will vary from 1300rpm at 25 degrees up to 2400rpm at 80 degrees.

Thanks for pointing me in the right direction.

Cheers
Miami

godfather
06-04-2004, 05:37 PM
Active PFC = Active Power Factor Correction I would guess, nothing to do with the fan.

But you have solved that one, thats good.