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So it would be 'not so great' to read out just the CPU temperature as a foundation for the fan-controlling.
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An intel mac has about 10 temperature sensors, that are continuously read out and are used for monitoring and setting the right fan speeds. In addition to that the fan-control-logic is quite complicate.
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If that program ever crashes or becomes incompatible cause of a System Update (or the readouts of the temperature sensor get inappropriate), the fans could get set to a wrong (too low) speed and this could probably damage the machine. a daemon) that adjust fan speed continuously. Adjusting the fan speed to CPU temperature requires you have a program running in the background (e.g. BUT: I did not take this route for smcFanControl, cause it has some risks. Yes, that approach is even better and could make your machine running cooler, when you are at higher loads. Wouldn't it be even better to read out the temperature and set the fan speeds depending on the readout than just set the minimum fan speed and let automatic fan control as defined by apple do the rest? The GPL sources of smcFanControl should be a good starting point. But maybe someone else is a good dashboard developer. I am currently working on improving smcFanControl as an application. Will there be a dashboard widget for smcFanControl? It's possible that there are solutions to control fan speed on PPC based macs, but I am not aware of any. So the approach of smcFanControl does not work. No, PPC based macs don't have an SMC controller. Will there be a version of smcFanControl for Powerbooks or other PPC based Macs? Some people have reported usage of this to make their MBP cooler and not crashing when running games under Windows.
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However if you set up a new minimum fan speed in OS X using smcFanControl and then restart into Windows, your settings don't get lost and that new minimum fan speed is used on Windows for that session. What about fan-control when I am in Windows runnig Bootcamp?Īt the moment you can not set minimum fan speed when you are in Windows (cause smcFanControl is a native OS X application). The sensor readout is very close to what CoreDuoTemp reports, but its not exactly the same cause of different sensors. The advantage is, that there is no Kernel Extension loaded for temperature readout and temperature should always be reported (some CoreDuo's stop temperature reporting after some minutes unfortunately). It's not the sensor on the CoreDuo CPU's. Which sensor is read out for the temperature? The settings you chose for minimum fan speed will get lost in two cases and the machine will fall back to default values:Ī) You enter standby mode and smcFanControl is not running (If its running it watches for standby and reapplies your settings when you wake up the machine). When will the new settings for minimum fan speed get lost? Setting it to zero is possible from the technical perspective but could probably damage your machine. Why can't I set my minimum fan speed to 0 rpm? smcFanControl only lets you set the fan speed in the range of Apple's min and max values. 2000rpm for the Core2Duo MBP and 1800rpm for the Core2Duo MB. The minimum default speed after Apple's latest SMC firmware update is 1000rpm for the MBP 15,4', 1500rpm for the MB 13,3'. The lowest settings smcFanControl allows are the Apple defaults. Move the sliders to the left and hit apply. How can I restore the Apple defaults for fanspeed?
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If you follow the instructions (no other fan control software is running etc.) you should have no problem running smcFanControl on a machine it has not been tested on. If you get the warning, smcFanControl tries to read out the fan-details directly from the System Management Controller. Technically smcFanControl supports every intel mac, but it does not come with defaults for every machine. I get a 'smcFanControl has not been tested on this machine' warning. They are just used for setting the appropriate rights.
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The entered login and password are not saved by smcFanControl. Why does smcFanControl asks for a login and password and which login/password do I have to enter? smcFanControl needs the credentials of an admin-user to set the appropriate rights to be able to change fanspeed.
However, the higher you set the minimum fan speed, the longer it will take for the fan speed to increase. smcFanControl lets the fans stay in automatic mode and just sets the minimum fan speed. Yes, fan speed will increase as defined by Apple. When I run smcFanControl and set a new minimum speed, will my fan speed still increase if the CPU load gets higher? Minimum fan speed then falls back to the system defaults values. All changes smcFanControl does to the fan controlling get lost after you shutdown your computer (power off, not restart) or enter standby mode (as far as you don't have smcFanControl running).
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