This time it's an Apple link.
http://discussions.apple.com/message.jspa?messageID=2141610#2141610
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This is the theory I think.
The cpu gpu and northbridge chips transfer their heat to the heatpipes via some thermal paste.
The heat is not getting transferred to the heat pipes properly because of the way the thermal paste is applied (too much thermal paste).
The hardware heat sensors are small green things and one is on the heatpipes.
So the hardware heatpipe sensor is detecting lower temperatures than it would if the thermal paste was applied properly (applied sparingly) and the fans don't start as often as they should so a fair bit of heat stays in the macbook.
With a thermal paste mod (thin layer of thermal paste) the fans will start up more often as the hardware heatpipe sensor is detecting higher temperatures in the heatpipes due to the properly applied thermal paste transferring more heat from the cpu gpu and nothbridge chips to the heatpipes.
As the fans start up more often more heat will be pushed out of the macbook instead of just staying in the macbook.
That sounds like what I read in that thread.