Cpu fan running to high

[Coro Dominicano]

My cpu fan is running very high RPM during bootup (Very loud noice), it will continue this way for a very long time. When I open up a overclocking utility.. (just by opening it, without changing anything), the fan`s rpm lowers dramatically. Can i do this another way without having to rely on the program

Board - Asus p4p800-e

 

[Mucker]

First, what kind of heatsink/fan are you using? In your motherboard bios there is an option called Q-Fan. If it is disabled the CPU fan header on the mb will get the full 12 volts and the fan will run full blast all of the time. If you enable Q-fan, you can reduce the voltage to that header so the fan will run slower by setting a desired ratio. You will see ratio's from 11/16 to 15/16. The lower the ratio, the lower the voltage supplied to the header, and the slower the speed your fan will run. With Q-fan enabled the fan will be controlled automatically according to the CPU temp.

Another way to slow it down after boot, is to put your utility program in the startup group and choose to start it minimized. Shortly after boot, you should start hearing the fan ramp down. I assume the utility has the ability to ramp the fan up when CPU temp rises above your desired minimum temp? I use this method with my Speedfan utility and it controls the fan very well.

Finally, you can put the CPU fan on a hardware controller and adjust the fan manuallly. You do need to monitor CPU temp and speed until you know what control range you are comfortable with.

m

 

[Coro Dominicano]

My Q-Fan setting was disabled, I enabled it and set the ratio to 11/16... i hope this is ok. My question is the following, if the Q-fan was disabled, what was controlling the CPU fan originally, for example in games the rpm hiked up to 5,200, and then lowered back to 4,000, If Q-fan is the one responsible, then what was working with the fan before?

 

[Mucker]

Again, what type of heatsink/fan are you using? And how do your case and CPU readings look at the 11/16 setting?

You will be ok with Q-Fan at 11/16 as long as the start voltage of the CPU fan is lower than what the 11/16 ratio provides. I have heard that some CPU fans do not start because of this. Simply look at the fan on boot. If it spins you're ok. The CPU will be protected with Q-fan enabled, the fan will speed up as CPU temperature increases.

If you didn't have a third party software utility controlling the fan, it could be that your HSF combo has a built in diode that controls the fan automatically according to CPU temp. Someone that knows more about this can provide info....

m

 

[Coro Dominicano]

Intel retail heatsink and fan, my cpu readings are 47 at idle and 55 at load. Does it sound ok?

I also feel my CPU fam is running to slow, at 1,875 rpm, is this a normal working velocity?

 

[Mucker]

Those temps look pretty good, you have nothing to worry about. The fan speed sounds about normal. You can bump up the Q-Fan ratio if you want more speed at the expense of noise obviously. If you can afford a new heatsink, you will most certainly improve your noise and cooling situation. Who is your motherboard manufacturer and what CPU socket are you using?

Good case ventilation will have a big effect on your CPU temps. Try to keep your wiring and cabling as neat as possible to have an unobstructed air flow path through the case. Blow out all of your fans, sinks, and PSU periodically to keep heat buildup to a minimum.

That being said, you look to be in pretty good shape, but certainly can be cooler if you desire......

m