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It may be that your fan does not include the rpm wire. It is usually yellow if you want to look and see. Should be connected pretty close to the CPU along with a black and red one.
You didn't ask this but I'll tell you anyway. You may want to install Gkrellm. It should be on the CD 2 or 3. In Mandrake 9.1 just go to start thing then Configuration then packaging then Install Software. Just search for Gkrellm and install it.
Make sure when you get a fan that it has three wires not two. Most Thermaltake fans are good for that. Go to www.allthingstech.com and check them out. That's where I bought the four that I have in my rig. They have better shipping rates. Also make sure you get the right size. Some are 60mm and some are 80mm even a few 90mm whoppers.
You may want to right click on the top part of Gkrellm and check the configuration and settings. This is how I set mine up. Open a console and type in sensors. Then click on the temp and adjust the factor and offset until you get the right temps. Just get it within a couple degrees is OK.
For comparison, mine usually runs about 90F to 95F when idle and about 105F to 110F when blowing smoke. I do have a really big heatsink and a temp controlled fan for the heatsink.
As far as I know the output of sensors is accurate. I would believe it above everything except the ones in BIOS.
You should not have to reboot. It just may take a few seconds to update Gkrellm though. It only updates every few seconds. Make a change and then wait a bit till you see it change. Do rerun sensors a bit to get the updated temps. It displays the temp at the time you run the command and does not update till you run it again. Those temps can chage pretty quick.
The other sensor is the 'ambient' tempeture.
Also note that you can right click on the part of the display that contains the temps and a new setup window will appear. You can adjust the size, height, and such in there. You can right click on different parts of the window and get different setup windows.
That temp is about normal. A lot depends on your heatsink size and the fan. Mine is pretty big and changes really slow because of the mass, of course it takes longer to cool when it gets hot too.
Hope that helps. You may want to put Canada in your profile and your distro. Helps us a lot you're when getting help. Look at mine below. It tells just about everything about my system.