Nice Cool 15" SR Macbook Pro

Discussion in 'MacBook Pro' started by miniConvert, Jun 27, 2007.

  1. miniConvert macrumors 68040

    miniConvert

    Joined:
    Mar 4, 2006
    Location:
    Kent, UK - the 'Garden of England'.
    #1
    There's no denying that these machines can get incredibly hot when under heavy load.

    However, under light usage the MBP really is incredibly cool. At the moment I'm just browsing around and doing my email. smcFanControl reports my temperature as 39c with the fans at 1998rpm. The underside of the machine is cool, and only the strip above the keyboard is notably warm.

    There's a lot of power in this 1" slab of aluminium, it's really quite an achievement. I just wanted to emphasise that when they're only under light load, the new MBP's are lovely and cool and quiet!
     
  2. rhagen macrumors regular

    Joined:
    Jun 13, 2007
    Location:
    San Diego, California
    #2
    39c seems abnormally cool. Idle my macbook hits up low to mid 40's
     
  3. miniConvert thread starter macrumors 68040

    miniConvert

    Joined:
    Mar 4, 2006
    Location:
    Kent, UK - the 'Garden of England'.
    #3
    I'm on battery at the moment, and have been on for over an hour :)
     
  4. Arkanok macrumors 6502a

    Arkanok

    Joined:
    Feb 13, 2007
    #4
    I've had mine at that temp too, while just doing stuff like browsing, but i find it has a lot to do with the temp of the room too, when i first got it, the room i was in was nice and cool, and thats when it was only at about 39 or 40, then once the days got a bit hotter and the room temp was higher, the light load temp went to about 46, - 50. Either way though, still cool on the touch. i find the only time mine gets too hot to put on my lap is when i'm playing WOW or something really intensive. Thats when the cpu temp goes way up lol.
     
  5. SteveM8 macrumors member

    Joined:
    Jun 13, 2007
    #5
    Mine is at 57 celcius

    and Im just using safari. It usually is between 55-60 while surfing and email.
     
  6. kolax macrumors G3

    kolax

    Joined:
    Mar 20, 2007
    #6
    My Core 2 Duo MBP is 50'C most of the time, sometimes reaches 56'C when doing internet, msn etc.
     
  7. rhagen macrumors regular

    Joined:
    Jun 13, 2007
    Location:
    San Diego, California
    #7
    I never really checked my temps, I was at 35 C. Never seen it that low but when I started doing itunes, surfing, and word; it jumped up to 54.

    I love our cool laptops haha.
     
  8. e12a macrumors 68000

    e12a

    Joined:
    Oct 28, 2006
    #8
    running on battery keeps it cool, with down-throttling of either cpu or gpu.

    plug it in, and you'll notice a few degrees increase. My g2 MBP stays at around 50-56. On battery its rarely above 50.
     
  9. Erasmus macrumors 68030

    Erasmus

    Joined:
    Jun 22, 2006
    Location:
    Hiding from Omnius in Australia
    #9
    Question on throttling:
    When it is on battery, the CPU and GPU are on a very low power setting at idle, and then increase their clock speed when they are put under load. I believe the GPU has two load settings, a lower one for 2D stuff, and a "full speed" for 3D stuff. How does this change when you plug it in to the wall?
    Cheers.
     
  10. miniConvert thread starter macrumors 68040

    miniConvert

    Joined:
    Mar 4, 2006
    Location:
    Kent, UK - the 'Garden of England'.
    #10
    Ok, been on the mains for an hour now, browsing and doing email.

    My temperature is 47c, fans still hovering around 1997rpm. The casing is warmer, as you'd expect, but I'm still very happy with how cool this runs!
     
  11. Sopranino macrumors 6502

    Joined:
    Sep 27, 2006
    Location:
    Alberta, Canada
    #11
    Generally speaking there are two separate power profiles, one for when the system is on battery and one for when the system is on the mains. The default profile for the mains is usually oriented in favor of performance whereas the default profile for the battery is biased towards energy savings.

    Although you probably know where the adjustments for these settings are Erasmus I'll mention them here for the benefit of those who don't

    Go into System Preferences/Energy Saver and select the drop down menu labeled 'Settings for', you can then select either Power Adapter or Battery. After that then you select the drop down menu labeled 'Optimization' and select the power profile that you want, or you can create your own using the sliders below.

    Hope this helps

    Sopranino
     
  12. Erasmus macrumors 68030

    Erasmus

    Joined:
    Jun 22, 2006
    Location:
    Hiding from Omnius in Australia
    #12
    Oh, OK. Yes, I did know where this stuff was, but it is my understanding that the real only settings the user can change is how long it takes for the screen/computer to go to sleep (Don't have a SR MBP handy to check). In some Apple documentation it makes the suggestion that CPU/GPU speed is throttled differently between "better battery life" and "better performance". Nothing substantial is given. So, does anyone know anything about the difference here? Does the MBP actually change its performance to optimise battery life or performance, or does it just go to sleep after 5 mins instead of 30?
     
  13. e12a macrumors 68000

    e12a

    Joined:
    Oct 28, 2006
    #13
    I'm pretty sure there's something going on, as many people have reported smoothness issues with expose, dashboard, and misc. 3d effects when running on batteries (i have noticed this to an effect with my own MBP), but somehow it becomes smooth again with power from the mains.

    to replicate this issue on my MBP, open iTunes, and have something like Firefox and Adium open (what i have now). Expose becomes noticeably slower. It also varies. Just open enough apps/windows to make it slow in expose (on batteries). Plug it in, and viola, no more slowness.

    considering how hot the power brick can get with the MBP attached, a C2D running at full bore (speed, not load) would get hot, not to mention suck up a lot of power.
     
  14. kolax macrumors G3

    kolax

    Joined:
    Mar 20, 2007
    #14
    Finally updated mine to the SR MBP.

    I did notice it does run noticabley warmer than my C2D but I used Fan Control v1.1 to adjust the fan speed, and it is about 45'C at idle, and never goes above 69'C if doing extreme stuff.

    I'd recmmend Fan Control for people who are experiencing warm SR MBP's. Sorted mine out.

    http://www.macupdate.com/info.php/id/23137
     
  15. kolax macrumors G3

    kolax

    Joined:
    Mar 20, 2007
    #15
    Never noticed that - reckon it only runs off one core on battery?

    I thought the power brick got hot because its stepping down the voltage - the battery is already at 12V's or whatever so shouldn't get roasting like the power brick.
     

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