Personally I have two profiles saved, one for times when I’m putting my iMac under what I consider to be a normal workload, and another for when I’m encoding audio/video. These options include a menubar readout and the ability to create favorite profiles which can then be applied for different situations. SmcFanControl offers all the options of iMac Fan Control with the addition of a few “advanced” options. The second program, and my program of choice for controlling the temperatures / fan speeds of my iMac, is smcFanControl. The preference pane also displays your desired / current fan speeds and the temperatures of the major components in your iMac. You can set a low and high temperature threshold and a minimum fan speed for your CPU, hard disk and optical drive.
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The program installs a preference pane in Mac OS X system and the options are fairly straightforward. IMac Fan Control is free and unsupported by the developer, but as of the writing of this article, works perfect on my 24-inch aluminum iMac. The first program I would suggest you look at is “iMac Fan Control” and is developed by Derman Enterprises. There are two freeware programs that I would recommend taking a look at to accomplish this task. Whatever the case, if you are in need of a relatively safe and easy way to increase your iMac fan speed to decrease your component temperatures you’re in luck.
This excessive heat can be caused by environmental factors (room temperature, ventilation, etc.), prolonged high CPU load (long periods of video encoding as an example) and, in some cases, faulty hardware (a faulty power supply heating up other non-faulty components). There have, however, been many instances where the internal components of an iMac have been damaged from excessive heat. That being said, I have not heard of anyone significantly decreasing the life of the fans in their iMac by increasing the speeds at which they run (within reason). Increasing the speed of your fans in your iMac may lead to a voided warranty and/or decreased fan life. As always, follow this guide at your own risk.
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