Idle rMBP fans @1998 and @2166? yours?

Discussion in 'MacBook Pro' started by Ulf1103, Aug 13, 2012.

  1. Ulf1103, Aug 13, 2012
    Last edited: Aug 13, 2012

    Ulf1103 macrumors 6502

    Joined:
    Jan 5, 2011
    #1
    Hy,

    my best friend google told me that the minimum fan speed for the MBP's is 2000 rpm.
    But what I noticed is that my left fan always spins faster then 2000 rpm (about 8%).

    (I'm using the iGPU (HD 4000), not the GT650M (which is located at the left fan, as far as I know) see image below, rMBP upside down, so right is left :) )


    Does anyone know why my left fan won't spin @±2000rpm?

    (@rMBP users, can you guys post your idle fan speeds? thanks
    ps: max fan speeds are also welcome, they should be ±6000 rpm
    right: 5498 ~ left: 5965)

    (2.6GHz i7)
     

    Attached Files:

  2. M5RahuL macrumors 68020

    M5RahuL

    Joined:
    Aug 1, 2009
    Location:
    Colorado
    #2
    Right Fan : 1997
    Left Fan : 2164

    Courtesy: iStatPro
    GPU : Integrated

    CPU Temp : 33 C
    GPU Temp: 35 C

    Usage : Spotify ; Outlook ; Excel ; and Safari with a few tabs.
     
  3. Dangerous Theory macrumors 68000

    Joined:
    Jul 28, 2011
    Location:
    UK
    #3
    I think you mean ~6000rpm. +- indicate speeds could be anywhere within a 12k rpm range
     
  4. inlinevolvo macrumors 6502

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    Jul 11, 2012
  5. dmccloud macrumors 6502a

    dmccloud

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    Anchorage, AK
  6. Ulf1103 thread starter macrumors 6502

    Joined:
    Jan 5, 2011
    #6
    well, yeah...
    technically speaking you're wright.

    I meant ~ (the give or take sign :p)
     
  7. Interstella5555 macrumors 603

    Interstella5555

    Joined:
    Jun 30, 2008
    #7
    Sorry, but that's the "up to" or "range" symbol, you're looking for "±"
     
  8. Ulf1103 thread starter macrumors 6502

    Joined:
    Jan 5, 2011
    #8
    well, actually, we need to use the ≈ symbol for it :p

    but if we use ± or ~ everyone will know what we mean :p
     
  9. eagandale4114 macrumors 65816

    eagandale4114

    Joined:
    May 20, 2011
    #9
    Standard mac behavior.
    The fans will normally run at about 2K.
    This app can control the speeds but it can only set the minimum fan speed, not the max.
     
  10. mopatops macrumors regular

    mopatops

    Joined:
    Jul 21, 2011
    Location:
    UK
    #10
    Complete speculation but if you're questioning the difference in speeds, could it be the shape of the heatsink covering both CPU and GPU? The CPU is centred but the GPU is off to the left, right?
     
  11. Youngesttim macrumors newbie

    Youngesttim

    Joined:
    Aug 7, 2012
    Location:
    Northern California
    #11
    My base model rmbp Is doing the same thing, I also hear a faint clicking sound from the side where power cable connects. When I put my ear on keyboard it sounds like the fan might be rubbing or something, my MBP 17" 2010 does not make that sound, it just has a normal hum. I have an appointment at genius bar tomorrow morning so they can hear it. Other than that it's a great machine with no problems...I will advise what they say...Just want to make sure it's a keeper
     
  12. cjw2222 macrumors newbie

    Joined:
    Aug 16, 2011
    #12
    I already made a thread about this a while back but it is completely normal. Due to the layout and cooling needs of the new notebook.
     
  13. Ulf1103 thread starter macrumors 6502

    Joined:
    Jan 5, 2011
    #13
    Yes, but, I used gfxCardStatus to make sure I was only running on the integrated graphics...
    So the GPU shouldn't be warming up...
     
  14. Youngesttim macrumors newbie

    Youngesttim

    Joined:
    Aug 7, 2012
    Location:
    Northern California
    #14
    update

    Perhaps it was sleep deprivation getting the best of me or a need for psych meds... ;=) or combination of both....

    No clicking sound could be heard with stethoscope at genius bar, and I cannot hear it anymore either.... it stopped!

    They also ran diagnostic and all checked out. Different fan speeds totally within normal parameters...

    I'm keeping it ;=))
     
  15. VFC, Aug 15, 2012
    Last edited: Aug 15, 2012

    VFC macrumors 6502a

    Joined:
    Feb 6, 2012
    Location:
    SE PA.
    #15
    The heat pipe design of the rMBP is unbalanced. The GPU shares the same heat pipe as the CPU, so the one side will be hotter; causing the one fan to run faster.

    The cMBP, on the other hand, has the heat pipes centered between the CPU and GPU. The heat transfer is evenly distributed. Consequently, the two fans run at nearly the same speed.
     
  16. Snesley Wipes macrumors regular

    Joined:
    Jun 29, 2009
    #16
    The fans speeds are offset in an attempt to reduce the pitch of fans running at the same time. Fan blades are asymmetrical as well for the same reason, to reduce noise.
     
  17. charlieegan3 macrumors 68020

    charlieegan3

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    Feb 16, 2012
    Location:
    U.K
  18. chrisfromalbany macrumors 6502

    Joined:
    Jun 24, 2010
    #18
    Are ppl using iStat to get those numbers for the fan speeds?
     
  19. mape2k macrumors regular

    Joined:
    Apr 18, 2011
    Location:
    Germany
    #19
    I doubt that the speed sensor on the fans are even accurate down to 10rpm...
     
  20. cjw2222 macrumors newbie

    Joined:
    Aug 16, 2011
    #20
    Yes
     

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