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Can max RPM change?

Last response: in Overclocking
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February 27, 2010 3:16:57 PM

I have my HSF set to max speed,~3300 rpm, and it will stay that speed most of the time. I was running a stress test yesterday and noticed something though. ( i was running prime 95 and orthos GPU stress to get max heat for my system.) my RPMs for up 4800. Is this normal, does anyone know what is going on?

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February 27, 2010 6:49:36 PM

Thats normal. What happens is when your cpu heats up to a certain point the fan spins faster to cool it down. You have a 4 pin connector connected to the cpu fan on the motherboard it automaticly adjusts the fan speed for you . Nothing to worry about its normal.
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February 27, 2010 7:07:23 PM

Ok thanks good to know. What I do not get is

1) when does the MB decide to do this and how.
I manually set my fan speed to max in bios 255 outto 255.
My bois does have option to run in thermal cruise mode, but I am not sure what all the options mean. I have the choices Target temp, ( I got this one) varience (easy enough), start temp (not quite sure what this means as I just set a traget temp and varience), stop temp ( no idea), stop time (... not even a clue). So i just set my fan to manual 255 out of 255.

2) can anyone explain these settings, I Have googled and found nada. Then again with out the right key wrods it hard to find what you want.

I am curious because I could keep my CPU quite abit cooler if I could comtroll this fan and I might be able to OC to 3.5 =). (athlon 630)
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a c 148 K Overclocking
February 27, 2010 7:07:58 PM

Holy jet noise Batman .... I cut my fans to 80% speed cause they were too noisy at 1500 rpm ...and they are 18dba fans :) 
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February 27, 2010 7:13:05 PM

Its not too loud,expecially compared to my GPU fan when it hits 50% (xfx 9800gt) not that gets loud. I tend to think somthing is lying to me and not really running full speed. When it was running at 4800rpm that was getting noisy, but i might would like it at about 4000 =). my temps range from 29 idle (27 room temp) to 50c prime load.
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February 27, 2010 7:18:39 PM

1)MB decides when certain temp is reached it kicks in the fan speed.

2)You have to play around with the settings in bios and see what each thing does i usually use bay fan controller to adjust the fan speed. I see that you have Target Temp enabled which should be when cpu reaches certain temps points the fan adjusts its speed.
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February 27, 2010 7:23:34 PM

Wizardsblade said:
Its not too loud,expecially compared to my GPU fan when it hits 50% (xfx 9800gt) not that gets loud. I tend to think somthing is lying to me and not really running full speed. When it was running at 4800rpm that was getting noisy, but i might would like it at about 4000 =). my temps range from 29 idle (27 room temp) to 50c prime load.


Your temps are normal under idle and load. If noise is not an issue and you want the lowest cpu temps then run it full speed. I would find a sweet spot temps/noise level and keep it there.
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February 27, 2010 7:40:51 PM

Best answer selected by Wizardsblade.
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February 27, 2010 7:56:16 PM

Wizardsblade said:
Best answer selected by Wizardsblade.

nThx for the best answer :D 
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a b K Overclocking
February 27, 2010 9:11:54 PM

Wizard - If your still around, what is the brand and model of the cpu heatsink fan? Any chance it is a high speed Delta fan?
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a c 86 K Overclocking
February 27, 2010 10:50:22 PM

It's probably stock 80mm? They spin really fast.
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a b K Overclocking
February 27, 2010 10:53:26 PM

Conumdrum - Yes, I saw 60mm and 80mm high speed fans when I googled. I think Delta has a high speed fan rated at 4000 rpm or used to have one. Can't imagine the noise.
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