Reduce MacBook Pro temperature in software

Reduce MacBook Pro temperature in software

Summary: A MacRumors forum post (direct download, PDF) by Rokem details a hack for the MacBook Pro fans that can significantly reduce its operating temperature. Now my processor is 40-50˚F cooler...

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TOPICS: Processors
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A MacRumors forum post (direct download, PDF) by Rokem details a hack for the MacBook Pro fans that can significantly reduce its operating temperature. 

Now my processor is 40-50˚F cooler... battery life is maybe 5 minutes shorter, and the fans are not all that much louder.

(Clarification: Reader Michael Booth notes that Rokem appears to have looked up the temperature conversion in terms of absolute values... 40-50˚F is actually 22-28 °C)

Rokem achieved the temperature reduction by modifying the plist files in AppleBlower.ktext and AppleFan.ktext. Essentially, he edited the speed values for both fans so they kick on a little sooner and run a bit faster.

The author claims that his MBP runs at the same temperature at 50 percent CPU utilization after the mod as it did at idle temperature previously. After the mod 100 percent CPU runs at the same temperature as 50 percent CPU. Obviously, your mileage may vary and caution should be exercised.

As best as I can tell the mod won't void your warranty, but increasing the demands on the fan will reduce your battery life slightly and could shorten the life of the fans. Be smart and backup the original ktext files before proceeding.

I've reported previously that you can monitor your MacBook Pro temperature with an excellent freeware application called CoreDuoTemp. My MacBook Pro 2.0GHz (week 7) regularly runs at around 165-185˚F after it's warmed up and I haven't yet to install the Rokem Fan Fix - but I plan to this week.

What is your MacBook temperature before and after the fix?

Topic: Processors

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3 comments
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  • A drop of 40-50 Fahrenheit degrees is 22-28 Celsius degrees

    Posted by Jason D. O'Grady @ 7:07 am !
    > A MacRumors forum post (direct download, PDF) by Rokem
    details a hack
    > for the MacBook Pro fans that can significantly reduce its
    operating
    > temperature.? Now my processor is 40-50?F cooler, and
    5-10?C for all
    > you out of the USA.

    I cannot vouch for this patch, but I can comment on the faulty
    Fahrenheit to Celsius conversion in the above posting. A
    temperature
    drop of 40-50 Fahrenheit degrees would work out to a drop of
    22-28
    Celsius degrees, and not 5-10 C?, as reported above.

    In the Fahrenheit scale, there are 180 Fahrenheit degrees
    between
    freezing (32?F) and boiling water (212?F). In the Celsius scale,
    there are 100 Celsius degrees between freezing (0?C) and
    boiling
    water (100?C). From this it can be seen that each Fahrenheit
    degree
    is a little bit more than half of a Celsius degree: 5/9th to be
    exact. So a drop of 40-50 F? would correspond to a drop 22-28
    C?.

    ...macuser1
    macuser1
    • Faulty Math

      I agree that his math isn't up to snuff, but he still claims that his
      MBP runs cooler. Has anyone else tried it yet?

      - Jason
      Jason D. O'Grady
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