Undervolting my MBP (Brand new 2.8 Ghz 15")

Discussion in 'MacBook Pro' started by rmbrown09, Apr 1, 2010.

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Do You Think Undervolting is Worth It??

  1. Yes, A little boost in battery life, and cooling of the notebook would be great.

    48.0%
  2. The difference is negligible and can just lead to problems

    52.0%
  1. rmbrown09 macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #1
    So I like tinkering with my computers. I always overclocked and undervolted my PC's, but now I'm a mac guy.

    So I have CoolBook Purchased and installed, but I'm not sure where to start, and what to do.

    Just as a note, I have accidental insurance, but I'm 99% sure you can't really hurt your notebook from undervolting, more just overclocking.
    Hoping to get a nice little boost in battery life, as well as cool this sucker down.

    Anyone out there have any advise or can help out? Thanks
    Also, If you would like wallpaper, click HERE

    [​IMG]
     
  2. PAC88 macrumors 6502

    Joined:
    Apr 23, 2009
    #2
    I don't understand why you would want to do this? is it purely just for fun and for the sake of experimenting? are you trying to see if it will improve battery life or something?
     
  3. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #3
    it's 30% just cooling it off. I like to game sometimes, and this thing can fry eggs.

    But more just to be able to say I did it. (or you guys helped me do it)
     
  4. PAC88 macrumors 6502

    Joined:
    Apr 23, 2009
    #4
    that's interesting, I've never really heard of anyone undervolting.. I wish I knew more about it so I could help you out.

    this is essentially the same concept as what the new i core cpu's are supposed to do?
     
  5. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #5
    Ummm, more or less.

    The new ix's can adjust the frequency they run at. But the Current C2D's can do that too.

    When the 2.8 isn't being fully used it can drop down to 1.5 Ghz.
    Undervolting is just taking the voltage of each Ghz level (can't think of a better way to say that) down.

    But making sure it still has enough power there to be stable.
    People have seen 10C drops after undervolting.

    Undervolting isn't adjusting the speed of the processor, just the power it draws to run.
     
  6. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
  7. Nano2k macrumors regular

    Joined:
    Nov 6, 2009
    Location:
    Europe
    #8
    In my opinion if the comp is not crashing I dont see the purpose with undervolting. In Windows 7 I have seen this Macbook go almost 105 deg Celsius and not crash. My previous Acer laptop would crash at 75-80 deg...

    There are plenty of threads about this on these forums, use the search function.
     
  8. Rafalski24 macrumors regular

    Joined:
    Sep 27, 2009
    Location:
    Denver, CO
    #9
    again, wish i could help. But since I can't, would you tell me where you got your background?! :D
     
  9. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #10
    I am looking for specific help on a t9600.

    Also, just because your computer doesn't crash doesn't mean it's good for it.

    There are tons of charts that show lifetime in hours of a component with different average temperatures. You can decrease the life of your components by 5+ years by running at ultra high temps.
     
  10. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #11
    Thanks, the background is from digitalblasphemy, normally you have to pay but, well I like the piratebay hows that.

    (you might be able to tell, I photoshoped the bottom right so the mark is gone)
     
  11. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #12
    I'd like a copy of that wallpaper if possible. :cool:
     
  12. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #13
    You can find the wallpaper in this group

    im 80% sure, either way you end up with some awesome wallpapers.
     
  13. adbge macrumors newbie

    Joined:
    Apr 1, 2010
    #14
  14. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #15
  15. indg macrumors 6502

    Joined:
    Feb 7, 2007
    #16
    rmbrown09,

    first be sure to get the latest v2.17 which was released yesterday.

    re coolbook settings, you really only need 2 settings:
    1. find the highest frequency that will run at the lowest voltage.
    2. find the lowest voltage for the highest frequency.

    so for example, on my 2.33ghz mbp, the frequency goes from 1002 mhz @ .95v to 2338 mhz @ 1.175v.

    for setting #1, i need to find the highest frequency that will run at .95v. through trial and error, my cpu can run at 1670 mhz @ .95v instead of the default voltage of 1.0625. if i bump it up to 1837 mhz @ .95v, i will see a kernel panic or system freeze.

    for setting #2, i need to find the lowest voltage at 2338mhz. through trial and error, my cpu can run at 2338 mhz @ 1.075v. if i lower it to 1.0625v and run a cpu stress test, i will see a kernel panic or system freeze.

    that's pretty much all you need for the adapter settings. for the battery settings, you really only need setting #1 because you want as much power possible (frequency) using the least amount of energy (voltage).

    hope that helps.
     
  16. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #17
    Thanks for the help just got the update, going to try this out now.

    [​IMG]
     
  17. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #18
    Alright so update (and problem)

    As you can see here I have set the voltage down quite a bit for the 2.8 setting (or near it, see bottom left window, top box has the 2.8 with my setting, below shows 2.8 with default)

    the fans aren't even turning on, but as you can see by the temp (97C), the thing is on fire.

    What is up with the fans? am i not doing something right??

    [​IMG]
     
  18. indg macrumors 6502

    Joined:
    Feb 7, 2007
    #19
    your fans should be spinning pretty good when you cpu is maxed out like that. even mine spin at around 4000-5000rpm when the cpu is maxed and temps usually stay below 70c. 95c is dangerously hot.

    you may need to install a third party fan control app and adjust your base fan speeds.
     
  19. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #20
    I dont see how voltage adjustments would mess with the fans??

    The temp is what sets the fans off yes? Unless it is a voltage RPM correlation, but that doesn't make sense.
     
  20. indg macrumors 6502

    Joined:
    Feb 7, 2007
    #21
    you're correct that the temperature sensors adjust the fan speeds. that's why i think it's odd that your fans aren't spinning fast enough to cool down the cpu. does it get that hot without coolbook? just seems odd to me.

    also in your screenshot, it shows 2793 mhz running at 1.1875v and not using your setting of 1.15. if you see that, coolbook is not working properly.
     
  21. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #22
    It just sits there quiet as a can be while the temperature climbs up. The fans don't kick on at all.

    And yes, I apparently cant figure out how to work the sucker..
     
  22. Nuck81 macrumors regular

    Joined:
    Oct 15, 2009
    Location:
    Western Kentucky
    #23
    To be perfectly honest I don;t even know where the vent and fan on my Macbook pro are located. My baby rarely even gets lukewarm, but it stays on the desk the majority of the time....
     
  23. rmbrown09 thread starter macrumors 6502a

    rmbrown09

    Joined:
    Jan 25, 2010
    #24
    Do some decent gaming, boot into windows, or anything really intensive GPU or CPU wise and it'll happen.

    Vent comes out behind the hinge.
    most of the time fan speed stays low in OSx
     
  24. kousuke18 macrumors regular

    Joined:
    Aug 25, 2008
    #25
    wow this reminds me of the problem I had with my old late 2008 umbp. The fans would refuse to ramp up even though the cpu temp hit close to 100 degrees C ... poor thing continued to cook itself until the fans finally ramped up when the temp hit 114 degrees C. :eek:
     

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