Penryn MBP Idle Temperatures

Discussion in 'MacBook Pro' started by Dragonforce, May 8, 2008.

  1. Dragonforce macrumors 6502a

    Dragonforce

    Joined:
    Apr 9, 2008
    Location:
    London (Ealing) UK
    #1
    Hi everyone,

    yesterday night I got bored at our company, and while I was alone I turned on all 4 MBPs and left them running for 30 mins with 98 - 100% idle. I noticed that theres really big differences in the idle temperatures between those MBPs (all of them are the early 2008 2.4 GHz Penryn stock models, except they all got 4 GB RAM)

    MBP #1 showed 38°C / 100°F CPU and 46°C / 115°F GPU
    MBP #2 showed 45°C / 113°F CPU and 55°C / 131°F GPU
    MBP #3 showed 46°C / 115°F CPU and 57°C / 135°F GPU
    MBP #4 showed 42°C / 108°F CPU and 50°C / 122°F GPU

    Each machine got its own desk made out of the same material with plenty of space, ambient temperature was exactly 21°C / 70°F. All of them were idle, fully charged, with the MagSafe plugged in.

    So, I have a few questions:

    Q #1: Why is the GPU always more hot than the CPU (it got nothing to do ?)
    Q #2: Why does MBP #1 almost run 10°C cooler than MBP #3 ?
    Q #3: Why does the GPU heat up together with the CPU ?
    e.g. I use CPU test (Glucas Test) which is supposed to cause only load on the CPU... so the CPU went to 80°C, but the GPU does go up to 85°C as well ?

    Also, I'd like to hear your Penryn MBPs idle temperatures, especially of your GPU.

    Thanks for reading,
    Kind regards,
    Alexander
     
  2. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #2
    #1: The 3D effects and eye candy is powered by the CPU.
    #2: Variations in heat conduction; varied thermal paste usage; environment
    #3: It's all one connect by one heatpipe. Heat transfers from hot to cool so if the heatpipe is hotter than the GPU, the heat will transfer from the heatpipes to the GPU.

    Mine:
    [​IMG]
     
  3. Dragonforce thread starter macrumors 6502a

    Dragonforce

    Joined:
    Apr 9, 2008
    Location:
    London (Ealing) UK
    #3
    Hey alphaod,

    thank you for your reply, especially the answer to my 3rd question sounds pretty interesting / logic. Also thanks for the iStat screenshot - those temps are almost the same on my MBP (+ - 2°C)

    I would appreciate it, if anyone else would share some screenshots of their own Penryn MBP when it has been sitting idle for a couple of minutes.

    Thanks again,
    Alexander
     
  4. zign macrumors 6502

    zign

    Joined:
    Apr 9, 2006
    Location:
    London
    #4
    Mine is the same as alphaod's (+-1).


    Were all the machines you tested fully charged?
     
  5. Dragonforce thread starter macrumors 6502a

    Dragonforce

    Joined:
    Apr 9, 2008
    Location:
    London (Ealing) UK
    #5
    Yes, it was like 2 AM in the morning and everyone was at home except me, so I took my chance to test this out before I went home as well. All the machines have been switched off for a couple hours (cold boot), all of them were fully charged and were in the same room with basically the same software installed.
     
  6. MacBookProJoe macrumors regular

    MacBookProJoe

    Joined:
    May 7, 2008
    Location:
    Seattle, Warshington
    #6
    My two fans are running at 2000 and 1998 respectively and my CPU is at 50 while surfing the net.
     
  7. Dragonforce thread starter macrumors 6502a

    Dragonforce

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    Apr 9, 2008
    Location:
    London (Ealing) UK
  8. MacBookProJoe macrumors regular

    MacBookProJoe

    Joined:
    May 7, 2008
    Location:
    Seattle, Warshington
    #8
    GPU heat sink 54.
     
  9. Dragonforce thread starter macrumors 6502a

    Dragonforce

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    Apr 9, 2008
    Location:
    London (Ealing) UK
  10. Burnsey macrumors 6502a

    Joined:
    Jul 1, 2007
    Location:
    Canada
    #10
    My 2.33ghz idles at around 49degrees. The GPU idles at 42degrees.
     
  11. Chali427 macrumors newbie

    Chali427

    Joined:
    Jan 22, 2008
    Location:
    San Salvador, El Salvador
    #11
    these are the temperatures when my 2.6ghz mbp is at about 90% idle, is it normal???, I think it is too hot...:eek:
     

    Attached Files:

  12. stealthninja macrumors member

    stealthninja

    Joined:
    Aug 15, 2006
    Location:
    MI
    #12
    here are my temps just browsing this page in safari (Penryn MBP)
     

    Attached Files:

  13. shoarthing macrumors member

    Joined:
    Dec 4, 2005
    #13
    . . . 12.5 hrs walltime; fancontrol installed & active - min set at 1500rpm.
     

    Attached Files:

  14. MacBookProJoe macrumors regular

    MacBookProJoe

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    May 7, 2008
    Location:
    Seattle, Warshington
    #14
    Where did you get the fan control?
     
  15. shoarthing macrumors member

    Joined:
    Dec 4, 2005
    #15
    . . . here.

    . . note that care will be needed if/when uninstalling.
     
  16. MacBookProJoe macrumors regular

    MacBookProJoe

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    May 7, 2008
    Location:
    Seattle, Warshington
    #16
    How are you guys taking those snap shots of your screen please....
     
  17. Neil321 macrumors 68040

    Neil321

    Joined:
    Nov 6, 2007
    Location:
    Britain, Avatar Created By Bartelby
    #17
    shift+command+4
     
  18. Burgess07 macrumors regular

    Burgess07

    Joined:
    Jun 10, 2007
    Location:
    Watertown, WI
    #18
    I finished watching a 2 hour movie in iTunes 5 minutes before I took this pic. The temps are what I usually average on a day to day basis...


    Picture 1.png
     
  19. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #19
    Command-Shift-4 is select screenshot. If you press the Space bar after hitting the previous sequence of keys, it will turn into a take selected window.

    90% idle? Do you mean 10% used? Also on both cores? The temperature seems about right-- 135F~57C. I usually manually set my fan to 6000RPM to cool the computer down if I need to.

    Is the room cold?
     
  20. Burgess07 macrumors regular

    Burgess07

    Joined:
    Jun 10, 2007
    Location:
    Watertown, WI
    #20
    It's about average temp, around 70˚F/21˚C
     
  21. snaky69 macrumors 603

    Joined:
    Mar 14, 2008
    #21
    [​IMG]

    Been plugged in for quit a bit, running safari + msn messenger
     
  22. Burgess07 macrumors regular

    Burgess07

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    Jun 10, 2007
    Location:
    Watertown, WI
    #22
    Looking good. What speed are your fans running at?
     
  23. eXan macrumors 601

    eXan

    Joined:
    Jan 10, 2005
    Location:
    Russia
    #23
    Wow those temps are cool.. my rev. B MacBook runs at 60-64C doing basic stuff when plugged in and 55 when unplugged O_O

    Edit: all with ambient room temp at 23C (rather cold lately :( )
     
  24. MacBookProJoe macrumors regular

    MacBookProJoe

    Joined:
    May 7, 2008
    Location:
    Seattle, Warshington
    #24
    Shoarthing, can you give me some advice on how you have (if you do) that fan control set up. Im not sure on the lower and upper threshold settings and base speed.
     
  25. ntrigue macrumors 68040

    ntrigue

    Joined:
    Jul 30, 2007
    #25
    Great Success!

    2.33C2D with many Dashboard items open and Safari open for the last few hours :)
     

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