3743 Views 5 Replies Latest reply: Aug 23, 2007 4:13 AM by Retired Engineer
First, all MacBooks and MacBook Pros run hot. It's the result of cramming heat generating components in a small volume. If you read the Safety information in your User Guide you will find that it warns not to use the computer on your lap or in an environment without adequate ventilation.
Most people are using utilities such as Hardware Monitor to measure core temperature and fan speed.
There are two utilities to control the fans:
You will find them at VersionTracker or MacUpdate. These utilities are third-party, un-authorized by Apple, and misuse can damage the computer.
In general there is little need to manage the fan because they are already under firmware control. The above referenced software is only able to increase or decrease the fans' idle speeds and nothing else.
Normal CPU core temperature range is 45-85ºC as a function of CPU load. Thermal shutdown occurs at 125ºC.
For more information search the forums because this topic has been covered in excess.
The scientifically accurate way to measure heat output is to place a carefully measured volume of water in an insulated container and wait till it reaches thermal equilibirum.
You then submerge your MacBook Pro in the tub of water and operate it as per normal and measure the increase in the temperature of water.
From this you can calculate the precise heat output from your laptop.
For more information consult this webpage for details. (NB You may need to use a styrofoam esky rather than styrofoam coffee cups for your MacBook Pro measurements.)
No doubt with a little search effort we might find a dryer method. For example, we might wrap the computer in a lead container of known mass and then apply the same technique as used with water.
Of course both methods will require testing in a vacuum or using the necessary instruments to take into account ambient room effects plus evaporative effects.
A high quality calorimeter is a must.