After buying a quiet power supply unit my new CPU cooler (Zalman CNPS9500A) arrived.
So far I am very happy with this device. I am using it for cooling down my Pentium 4 2.40GHz CPU. And sensors shows the following temperature and fan speed:
pbuetow@sentax:/proc/acpi$ sensors fscher-i2c-0-73 Adapter: SMBus I801 adapter at 1c00 +12V: +12.22 V +5V: +4.94 V Battery: +3.04 V Fan1/PS: FAULT (div = 2) Fan2/CPU: 1500 RPM (div = 2) Fan3/AUX: FAULT (div = 2) Temp1/CPU: +39.0°C (high = +77.0°C) Temp2/MB: +36.0°C (high = +57.0°C) Temp3/AUX: FAULT (high = +49.0°C)
And I can't hardly hear the fan. It's automatically throttled down by the mainboard (Fujitsu Siemens D1527) because the CPU is cool enough. Additional I've the opportunity to regulate the speed of the fan by an external control pad on top of my computer case:
I figured out, that I do not need to control the speed of the fan manually. The mainboard does a pretty good job itself. I may will use this extra control for an additional case fan instead.
Right now my router (IBM ThinkPad T20) is louder than my desktop computer. This is caused by the 2,5" HDD. My T42 is silent. :)
Update: Now my CPU is always around 39C. But my Hard Disk is 41C. Its limit is 50C but strange, that my CPU is now cooler than my Hard Disk! I've to enable the additional case fan ASAPs :)

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