Temps of MBP CD vs MBP C2D SR

Discussion in 'MacBook Pro' started by digyourownhole, Jul 31, 2007.

  1. digyourownhole macrumors newbie

    Jul 30, 2007
    I recently upgraded from a MBP Core Duo 2GHz (which my girlfriend now enjoys) to a MBP Core 2 Duo Santa Rosa 2,2GHz, 15-inch.

    The MBP CD always was a lovely quiet machine. Hardly ever would the fan's rev up so you'd hear them. The MBP C2D SR however rev's up when on the power-outlet with a battery that is almost empty (working on battery or on outlet with charged battery is no problem) with simple tasks like scrolling through a 4 gig iPhoto library (exessivey, as in constant scrolling). The rev's of the fans quikely hit 6000 rpm!

    I compared both machines. Whe working normally, charged battery, on power-outlet, the memory controller of the MBP C2D SR is on average 10 degrees celsius hotter than the MemController of the MBP CD.

    Than I did a 'yes'-test (type in yes in terminal and hit enter, this will stress the CPU). Let both machines run for about 10 minutes. Here are the temp readings on both machines (in degree celcius)?

    MPB C2D SR:
    CPU 69
    GPU 69
    GPU Heatsink 59
    Heatsink A 55
    Heatsink B 46
    Enclosure Bottom 38
    Memory Controller 64
    RPM 5479

    MPB CD:
    CPU 70
    GPU 51
    GPU Heatsink 58
    Heatsink A 34
    Heatsink B 37
    Enclosure Bottom 36
    Memory Controller 58
    RPM 4890

    Especially the heatsink's differ a lot (more than 20 and 10 degrees celcius).

    What might be the reason for these high temp differences? thermal paste?

    I hate the machine reving up so much, i am used to the quiet fan's of MBP CD and Powerbook G4.

    What are the readings other MBP C2D SR owners get?
    And, do you all have the same issue with revs going quickly to 6000rpm when charging empty battery and doing minor things like scrolling through iPhoto? (i think this also is related to the MemController reaching temperature of 61 degree celcius, this is when the fans kick in big time.
  2. brandonshough macrumors regular


    Jul 19, 2007
    Phoenix, AZ
    Here are the temp results after "yes" test for 15 minutes straight after the machine has been on all day...

    MPB CD 2.16:
    CPU 66
    GPU 47
    GPU Heatsink 55
    Heatsink A 41
    Heatsink B 42
    Enclosure Bottom 34
    Memory Controller 48
    RPM 5280

    Now.... Keep in mind I removed the stock thermal paste and added arctic silver 5 :D
  3. randfee2 macrumors regular


    Jun 13, 2007

    These are while watching an mpeg movie and surfing the net and other stuff...
    The GPU does go up to 88°C when playing games!
  4. digyourownhole thread starter macrumors newbie

    Jul 30, 2007
    Thanks so far for all the replies. Can you tell me how the fan's are acting when charging an empty battery and doing some not to intense activities (like scrolling through iPhoto)?
    My MBP quickly hit's 6000rpm, which makes it unusable for use in library (where i often am working).

  5. randfee2 macrumors regular


    Jun 13, 2007
    my fans are off most of the time. I suggest you turn down the power settings to "Battery Energy Savings". That will underclock the CPU if it isn't needed by quite a bit. It is plenty of performance for everyday tasks and lets your machine run a lot cooler!
  6. digyourownhole thread starter macrumors newbie

    Jul 30, 2007
    I was working on my former MacBook Pro (Core Duo). What i noticed (never noticed before) is that in this model the Memory Controller gets way hotter while charging an empty battery than while woking on power-oulet on full battery, or just working on battery. (the temp right now is 67 degrees opposed to rond 45-53). However the fan's don't rev up to 6000.

    This, to me, would almost certainly have to indicate that the fans hitting 6000rpm on the MacBook Pro Core 2 Duo Santa Rosa (because of the Memory Controller reaching 61 degrees and up) has to do with a firmware issue (or consious choice bij Apple).

    So hopefully the firmware will get an update keeping the fans from hitting 6000rpm. I'd rather have a hotter MBP than a loud one.

Share This Page