The only times I really see the clock speed go up is during game play, transcoding video, etc. Usually the CPU runs well under the nominal 2.8 and hovers around 900 MHz while idling, roughly 1.7ish while streaming from Hulu or playing a locally stored HD file or about 2.8 while watching HD on Netflix.
I strongly doubt I’ll ever see 4.0 GHz since it can only do that when running on a single core. My Mac has a 4980HQ Haswell that is nominally rated at 2.8 GHz with a maximum turbo speed of 4.0 GHz. Run it while you’re going through your normal routine and you’ll see that your Mac’s clock speed is highly variable. Google Intel Power Gadget and download it. Many Intel CPUs support a Turbo mode, but it isn’t switched on or off, the speed changes dynamically as the load changes and if you’re not doing anything CPU intensive, this software isn’t really necessary. How to enable or disable Turbo Boost on your Mac here. Rehman writes, “Before you begin to manually enable or disable Turbo Boost on your Mac, it is important to check if the machine in question supports Turbo Boost.” “So if you are on the road and want an extended period of battery time out of your MacBook, disabling Turbo Boost might help you get more work done while on the go.” Disabling Turbo Boost can also help increase battery life by 25%,” Rehman writes. In this case, you may want to manually disable it for some time to see if it helps cool it down. “If you think your Mac’s fan noise is loud and if it’s generally heating up without much reason, it could be because of Turbo Boost which is at play. “However, Apple gives you no real control over it, which essentially means you cannot turn it on or off at will. “Apple has been bundling its Mac computers with Intel processors for a while now, which means the chip-maker’s Turbo Boost technology can be found in supported Mac models,” Zayed Rehman writes for Redmond Pie.
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