The boys at GlacialTech thought they would sell more 4100s if they kept wires out of the jpegs so as a result I cannot find a picture of a 4100 with its wires. Just a beautiful gold heatsink with no wires. So I have no idea how the temperature monitoring actually happens. But.... Usually a thermistor is how you temperature control a fan's speed. Here's how that works. All cpu fans take a 12V voltage input and then produce rpms. All fans can be reduced in rpms by giving them less than 12V. All fans, given a 6V supply of voltage, will run at about half their normal rpms. The 4100 has a temperature regulated fan which means that at max temp it must run at 12V and at lower temps it must run at a lower voltages. This is done by a thermistor, probably. No idea since they publish no doc or pics. If you stick a resistor onto a power wire for a fan some of the dc voltage supplied to that wire gets used up by the resistor which leaves less for the fan and that makes the fan run at a lower speed. A thermistor is a resistor which has its resistance varied by temperature. At max temp a thermistor has no resistance which means it acts like just a wire so the fan can run at max speed. So if the 4100 has a thermistor you just cut the wires off on either side of it and then re-attach them. This takes away any temperature-created resistance and causes the wire to have no resistance and the fan will then run at max speed. So if you can find the thermistor, cut it off and re-attach the remaining wires and then your cpu fan will run at max speed. Pretty simple really. This would be easier to explain if there were some pics online.

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Thank you for everyone's help. I think I may have discovered the problem... When I put on my first heatsink (the GlacialTech), it already had the white, zinc based thermal paste applied. I heard that this stuff tends to ooze when it gets hot, and I'm thinking that it may have seeped through the hole on the top of the P4 heat spreader. I read that you are not supposed to put thermal paste over this hole. As a result, no re-seating or cleaning I did after that first heatsink would matter since the stuff had already gone under the heat spreader. Does this make sense or is it a possibility? Thanks again...

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The P4 hole has a created a lot of stories on the web. Its there for pressure relief during manufacturing. When the heat spreader is epoxied to the organic land grid array it releases gas as it cures. If there were no hole the pressure would build up and cause wet epoxy to blow out the sides resulting in an uneven bond between the ihs and the olga. Intel does not publish anything to indicate that paste should not be put over (and therefore into) this hole, and certainly if they did not want us to put paste over the entire ihs they would have said something to this effect. So I do not think that is your problem. I put a 2.4g p4 into case that had had a 1.4g t-bird in it and the temps went up a little for me as well. Never did figure it out, but fan speed is the main thing that cools your hsf and that p4 fan is pretty quiet. Did you try any wire modifications to make the 4100 run at max speed? I know of no way to make it run at max speed other than eliminating the thermistor. If you try it and find that its too loud, you can always splice it back in.

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I found some pics at NewEgg that sort of show the wires on the GlacialTech. I don't think there is a thermistor on it, but I'll check when I get back home. You're right about the fan speed, since it was really only running at about 2600rpms max at any time. Thanks again...this is my first post here and I appreciate the response.

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I just looked at that pic too. The front wires have the 3-pin mobopower plug, the back wires (hidden in the pic) should have a thermistor on one of them.

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