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MacBook Pro Temperature Control

01/06/07 | by JAdP | Categories: Blog

I believe that Mark Twain said that a man with two watches never knows what time it is. Segal's Law: "A man with a watch knows what time it is. A man with two watches is never sure." Like that man, I have no idea what the CPU operating temperature of my MacBook Pro is, as I have three monitors now: CoreDuoTemp, Fan Control and iStat Pro. In °C, here are five readings from those three monitors, in the order listed, over a 15 minute span.


Some of this may be due to different sampling rates and display changes, as the three change at different times, wtih iStat Pro seeming to have the longest interval between changes, and Fan Control having the shortest. You many also notice that there isn't any consistency in the difference from one monitor to another, or in which monitor reports the lowest CPU temperature, though Fan Control is consistently the highest.

Based on this, I changed my set points in Fan Control so that the lower threshold is now 53°C and the higher being 79°C, so as the fans don't come on too often, which they seemed to be doing when Fan Control's lower threshold was set to 50°C, but they stay on a bit longer if things really heat up. Fan Control has been a big help in optimizing the performance of my MacBook Pro.

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1 comment

Comment from: Jeffry

I’m using MBP 2.4Ghz (2008) and after using more than 3-4hours (just browsing) my MBP tempt reach 82C-85C. Can you give me a optimal setting for fan control? Thanks.

03/16/10 @ 01:54
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I'm Joseph A. di Paolantonio and this blog has two main foci: my interest in food, and my interest in the future. This provides a look into my personal life, and is separate from my consulting work…though there will be overlap. I am an independent researcher, working as a strategic consultant and I'm an executive with over 20 years of commercial experience with a technical interest in the intersection of Internet of Things, with advanced data management and analysis methods. I view data science as a team activity, and I feel that the IoT must be viewed as a system. I am leveraging my past activities to understand the adoption and impact of the IoT; first, as a system engineer in aerospace, where I developed Bayesian risk assessment methods for systems within the Space Transportation System (including the Space Shuttle), Extreme Ultraviolet Explorer, Gravity Probe B, and many more, and second, as a enterprise data warehousing, business intelligence and analytics professional. Between my aerospace and IT careers, I indulged my hobby of cooking by starting a food company, Montara Magic, centered around my chocolate sauces. My education combined chemistry, mathematics and philosophy. I performed research into molten salt fuel cells in graduate school, and in photovoltaic materials for a short time in industry. The lure of bringing the human race into space was strong, and when I was offered the chance to combine my chemistry and mathematics skills to develop new risk assessment and system engineering methods for space launch and propulsion systems – I couldn't resist. I perform independent research and strategic consulting to bring value from the Internet of Things, Sensor Analytics Ecosystems and data science teams.I am a caregiver, a lover of science fiction and speculative fantasy, and my passion to learn has led me to a pilot's license, an assistant instructor in SCUBA, nordic and alpine skiing, sea kayaking, and reading everything I can, in as many topics as I can.

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