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Apple issues update for MacBook Air, warns against processor-speed tools
The Unofficial Apple Weblog (TUAW) — ... According to Apple, this update should not be installed until applications that modify processor operating characteristics (i.e. frequency and voltage), like CoolBook, are removed from the system. Apple says that these applications are not supported. ...

MacBook Air Update address video, processor issues
MacFixIt — ... . An Apple support page states "third-party software that modifies processor operating characteristics such as frequency and voltage is not supported and should be removed before installing this update." Presumably Apple's warning applies to applications like CoolBook . Feedback? ...

MacBook Air owners find latest Apple fix producing mixed results
AppleInsider — ... both cores active under most temperatures but lowering the clock speed, producing much the same result. "This 'update' is a farce - all that it does is step the processor down to 800MHz as soon as the [temperature] rises to some ridiculously low [level]," one Air user explains. Common troubleshooting steps appear to rule out software as the cause, even with complete operating system reinstalls. A number of less cautious owners have taken to installing the unofficial third-party app CoolBook to adjust system voltages and force the system to run at full speed but at lower ...

Weekly Utilities Update: PlugUNCool, A Better Finder Attributes, MacDust, more...
MacFixIt — ... be able to control the overall speed of their CPUs in order to better manage the heat dissipation and additionally improve battery life at the expense of computing power. This can help for long-term battery usage and also reduce fan noise. CoolBook is a utility that can fine-tune the voltage and processor speed of intel-based Mac, including laptops, Mac Minis, and iMacs. The latest version (2.14) provides the following new features: You can download this utility from the developer's website . WARNING: Increasing the CPU voltage and frequency above factory specifications may ...

MacBook Air running hot due to 'kernel_task'
MacFixIt — ... recommend a cpu undervolting to reduce this heating. they use CoolBook you can get it for $10. i just installed it and hope that it helps." When attempting any of the solutions provided here at MacFixIt or by anyone posting on any site, it is always best to have a stable backup of all your data. Resources Read this ...