OK, I know I should replace the stock retail Intel P4 cooler with something else, but...
My system has been running for 2+ months with the stock P4 heatsink, with the fan quite consistant at ~3300 RPM (CPU~=57C, MB~=32C). It's a P4 3.06 GHz on an ASUS MB with their Q-fan enabled in a Thermatake Xaser III case (not recommended for various reasons). PS is a Nexus. The system is running F@H and all the usual stuff (e.g., XP). The sound level was adequate for the lab environment, for now.
Suddenly, yesterday, the CPU fan jumped to ~5200 RPM and is now quite a loud turbine (really annoying). CPU and MB temps are virtually unchanged and do not seem correlated at all with fan speed. The fan speed will occasionally return to ~3300 RPM, but appears to be much more variable overall. What changed yesterday? I moved the case 90 degrees! Returning it back to it previous position has not altered this new unruly behavior.
I'll next try turning off the ASUS Q-fan. Meanwhile, do any of you SPCR sages have suggestions what might be causing the fan (and noise) speed-up and what I might do about it?
Stock P4 cooler fan suddenly takes off
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee
Re: Stock P4 cooler fan suddenly takes off
Two ideas...tragus wrote:I moved the case 90 degrees! Returning it back to it previous position has not altered this new unruly behavior.
I'll next try turning off the ASUS Q-fan. Meanwhile, do any of you SPCR sages have suggestions what might be causing the fan (and noise) speed-up and what I might do about it?
1. Did you turn the case 90 degrees from vertical to horizontal? If so, you may have caused some kind of disconnect between the CPU and HSF and the QFan responded accordingly to maintain temps. Check the seating of your HSF.
2. Maybe Q fan was turned off somehow and the fan is running at full blast now that nothing is managing it.
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Remember, too, that the stock Intel HSF is thermistor controlled. See the P4 HS roundup review if you don't know about this.
Something must have changed to make the CPU/HS area hotter and the internal thermistor (in the hub of the fan) is seeing higher temps and kicking the fan speed up. Or it could even be that something was lodged in the fan thermistor area that insulated it previously from heat, and now it is not insulated anymore, thus giving you speed changes based on temp changes. (That's a long shot...)
Something must have changed to make the CPU/HS area hotter and the internal thermistor (in the hub of the fan) is seeing higher temps and kicking the fan speed up. Or it could even be that something was lodged in the fan thermistor area that insulated it previously from heat, and now it is not insulated anymore, thus giving you speed changes based on temp changes. (That's a long shot...)