How to Check CPU Temperature on Mac. Last Updated: December 18, 2016 12:07 pm. Share on Facebook. Tweet on Twitter. There are a lot of reasons why you might want to check the CPU temperature on your Mac. You might be benchmarking a new machine you bought, or maybe you’re just trying to figure out when the fans kick in. Fanny Widget - Monitor your Mac's fan speed and CPU temperature from your Notification Center for free.

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I had many BSODs (randomly) and I had no idea what was going on. My configuration is a system of an Apple iMac 'Core i5' 2.66 27-Inch (Late 2009), with the following identifiers: Late 2009 - MB953LL/A - iMac11,1.

IMac HDD Fan Control does not require Apple’s temperature sensor or cable to obtain the drives temperature as it uses the S.M.A.R.T (Self-Monitoring, Analysis and Reporting Technology) protocol built into all drives, this means you no longer need the temperature sensor or cable for the fan to operate correctly. Download & Try for Free. If, having employed the earlier techniques, you are still concerned about the temperature of your Mac, you could give it a little help by running the fans a little faster. This is done with a small app, SMC fan control, that allows you to manually adjust the minimum speed of the fans – from the default minimum of around 940rpm to 3,800rpm.

- This is a known toaster sytem. I mostly operating this system under Bootcamp partition, wearing Windows 7, Ultimate - 64bit (many applications under Windows platform). I had NO FANS at all. Take a look at the temperatures I had before running MacFan: (Fan #0 (ODD) was running at 1010 rpm).

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Some Apple products contain sensors that respond when they detect temperature changes inside your system or device, turning on fans to bring cooling airflow to critical components.

About fan noise

If your device's processor is working on intensive tasks—such as compressing HD video, playing a graphics-heavy game, or indexing the hard drive with Spotlight after you migrate data—the fans run faster to provide additional airflow. You might hear fan noise when this happens, especially if you're in a quiet environment. This rushing-air sound is a normal part of the cooling process.

Ambient temperature, the temperature outside the device, also plays a role in the fans' responsiveness. If the ambient temperature is high, the fans turn on sooner and run faster.

If you hear the fans in your Mac Pro running at full speed and you aren't performing any intensive tasks, check the enclosure. Make sure that your Mac Pro is locked and fully seated, or that the top cover or access door is closed and locked on rack-mounted models.

Make sure the vents on your Apple product aren't blocked

Some Apple products have vents that let fans bring in cool air and expel hot air. Make sure that the vents aren't blocked to allow your device to perform at its best.

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Apple TV 4K has a fan and a vent at the bottom.
Airport Extreme and Airport Time Capsule have fans and vents at the bottom.
iMac has vents along the bottom edge and on the back.
iMac Pro has vents along the bottom edge and on the back.
Mac mini has vents at the bottom to bring in cool air from beneath the device and vent hot air from the back.
Mac Pro has three fans on the front of the computer and vents on the front and back.
MacBook Pro has vents along the side and on the back. MacBook Air computers have vents along the back near the clutch.

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The surface your device rests on can block its vents, affecting fan behavior. If you use your device on a soft surface like a couch, pillow, bed, or your lap, its fans might run more. Using your device on a hard, flat surface like a table or desk is best for temperature control.

Learn more

If the fans in your Mac run fast even when it isn't experiencing heavy usage and is properly ventilated, you might need to reset the System Management Controller (SMC) on your Mac. If you're experiencing this issue on an Apple TV 4K, Airport Extreme, or Airport Time Capsule, unplug the device, then plug it back in.

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Learn more about the operating temperature of Apple notebook computers.