Results 1 to 10 of 10
  1. #1


    Member Since
    May 22, 2011
    Posts
    3
    MacBook Air fan goes WAY over 6200 RPM via hacking :D
    Hello guys!
    I just downloaded SMC and started playing with it.
    After reading & documenting, i saw that the max speed of the MBA fan is 6200RPM
    And i asked myself, "What if i use a higher value?"
    This question popped up because i remember that one day, while i reseted my PRAM, the fans goed to like 11000RPM (They where making the sound of a chainsaw )
    So, i wanted to try 6300RPM

    First,
    Code:
    python -c "print hex(6300 << 2)"
    Result,
    Code:
    0x6270
    So, i'll use 6270

    Second
    Code:
    sudo smc -k "FS! " -w 0001
    to force the fan to my speed

    Third,
    Code:
    sudo smc -k F0Tg -w 6270
    To set the target speed to 7200RPM
    I could hear that they are going faster. Now i am on 7200RPM, in the hot summer, and only 54 Degrees celsius

    I'm wondering, what's the REAL MAX speed this fan can go?

  2. #2

    cwa107's Avatar
    Member Since
    Dec 20, 2006
    Location
    Lake Mary, Florida
    Posts
    26,944
    Specs:
    15" MBP, Core i7/2GHz, 8GB RAM, 480GB Crucial M500 SSD
    Quote Originally Posted by andreigherghe View Post

    I'm wondering, what's the REAL MAX speed this fan can go?
    I would wonder how you're going to replace it when the bearings are destroyed because it's being spun out of tolerances.
    Liquid and computers don't mix. It might seem simple, but we see an incredible amount of people post here about spills. Keep drinks and other liquids away from your expensive electronics!

    https://youtu.be/KHZ8ek-6ccc

  3. #3


    Member Since
    May 22, 2011
    Posts
    3
    Quote Originally Posted by cwa107 View Post
    I would wonder how you're going to replace it when the bearings are destroyed because it's being spun out of tolerances.
    This is why I asked
    To know if it's good or not. If you say that it's not good, then I'll not use it.
    Thanks for the advice!

  4. #4

    Moss's Avatar
    Member Since
    Feb 22, 2011
    Location
    Portland, OR
    Posts
    368
    Specs:
    MacBook Pro|15" Hi-Res Anti-Glare|2.2 GHz quad i7|4GB RAM
    I'd not spin it any faster than it's original max speed at all... But that's personally. It is interesting, and I'm admittedly curious, as to how fast it will actually get to! Either way, take care o' that machine and let 'er slow down!
    Facebook|Twitter
    If someone is being helpful, use the reputation system on your left!

  5. #5

    cwa107's Avatar
    Member Since
    Dec 20, 2006
    Location
    Lake Mary, Florida
    Posts
    26,944
    Specs:
    15" MBP, Core i7/2GHz, 8GB RAM, 480GB Crucial M500 SSD
    Quote Originally Posted by andreigherghe View Post
    This is why I asked
    To know if it's good or not. If you say that it's not good, then I'll not use it.
    Thanks for the advice!
    I'll go one further. Stop monitoring your temps and manually manipulating the fan speed. This is not an overclocked gaming rig and they do not need to be monitored. You're just making yourself paranoid AND you're putting undue stress on your fans that will ultimately lead to shortened service life and an expensive repair.

    Your fans are thermostatically controlled by a systems management controller that was designed by the very same engineers who designed your computer's thermal controls. They knew what they were doing. There's no reason to second guess them.
    Liquid and computers don't mix. It might seem simple, but we see an incredible amount of people post here about spills. Keep drinks and other liquids away from your expensive electronics!

    https://youtu.be/KHZ8ek-6ccc

  6. #6

    thurstmw's Avatar
    Member Since
    Sep 29, 2010
    Location
    BoCo
    Posts
    295
    Specs:
    13inch 2.3 i5 MBP 64gb SSD 320gb HD 8gb 1333
    fans are only like 30 bucks on ebay so if you want to mess with it I say go for it. I would imagine if you keep putting more voltage(?) into it, it will keep going faster until you burn out the motor.

    Yes that is a grizzlycorn

  7. #7

    robduckyworth's Avatar
    Member Since
    Jan 04, 2011
    Location
    Reading, UK
    Posts
    2,971
    Specs:
    15" MBP, 2.5GHz i7, 750GB, 6770M 1GB, iPad 3, iPhone 4, custom PC
    Quote Originally Posted by andreigherghe View Post

    I'm wondering, what's the REAL MAX speed this fan can go?
    Im literally just wondering: why.
    If you find a post helpful, don't forget to use the reputation system (top right of post.)
    Join us in the IRC! How? Add me on Steam, Origin or PSN (Vita): robduckyworth

  8. #8


    Member Since
    Mar 23, 2011
    Location
    Leuven, Belgium
    Posts
    29
    Quote Originally Posted by cwa107 View Post
    I'll go one further. Stop monitoring your temps and manually manipulating the fan speed.
    No, no, you don't understand ! He should go out and try to push that fan to the max ! By the time we see him flying overhead faster than the limits of 3G connectivity, we'll know about that Easter Egg that all the rumours claim has been built into the MBAs: a helicopter !


    Peter.

  9. #9


    Member Since
    May 22, 2011
    Posts
    3
    Quote Originally Posted by PeterJP View Post
    No, no, you don't understand ! He should go out and try to push that fan to the max ! By the time we see him flying overhead faster than the limits of 3G connectivity, we'll know about that Easter Egg that all the rumours claim has been built into the MBAs: a helicopter !


    Peter.
    I must admit that this is a pretty funny response

    And, i stopped monitoring the fans. No SMC app, no temp status, just the stock Manager.

    Thanks for the responses!

  10. #10

    Brunhild's Avatar
    Member Since
    Oct 09, 2008
    Posts
    110
    Specs:
    MBP 2.26 8GB RAM 500GBhdd, iPhone 4, and iPad
    we always mess with all the scrap machines at work.

    Max fan speed constantly, sometimes we remove all the fan blades and see how long something will run for before total destruction.

    lol.. fun times.

    I wouldnt ever mess with the fans in my macbook pro though, lol...
    my beer blog, BEERUKEN! www.beeruken.com

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Hi fan rpm's on iMac
    By Straitsfan in forum Apple Desktops
    Replies: 14
    Last Post: 12-17-2014, 11:52 PM
  2. How To Increase Fan RPM on Macbook Pro
    By esrever in forum Apple Notebooks
    Replies: 7
    Last Post: 01-25-2011, 05:59 PM
  3. Overheating and Fan RPM
    By fedetz in forum Apple Notebooks
    Replies: 5
    Last Post: 10-21-2010, 12:12 AM
  4. fastest fan rpm
    By jah in forum Apple Notebooks
    Replies: 2
    Last Post: 07-15-2008, 07:20 AM
  5. Right Fan at 0 RPM. Dead?
    By tyson0016 in forum Apple Notebooks
    Replies: 8
    Last Post: 10-22-2007, 11:45 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •