13" MBP CoolBook Settings

Discussion in 'MacBook Pro' started by vant, Jul 4, 2009.

  1. vant macrumors 65816

    Jul 1, 2009
    I can't set the voltage for any of the settings lower than .8750V, is this normal?

    Also, in regards to the aging of the CPU: If you run your CPU at 800mhz at .875V vs 1.6GHz at .875V will that age the CPU more or the same (basically, do processors age from voltage or clock)?

    Currently my 2.26GHz can run all clock frequencies at .8750V. I'm trying to figure out if I should leave it at 2261MHz/.8750V or if I should add 798MHz/.8750V also to prevent aging.


    At this moment I am running:

    798MHz / .8750 V
    2261MHz / .8750 V

    For both Adapter and Battery due to fears of aging the processor.

    Default is:

    795 MHz / .8750 V
    1596 MHz / 1V
    1862 MHz / 1.025V
    2128 MHz / 1.0375V
    2261 MHz / 1.0375V
  2. Lounge Deluxe macrumors regular

    Jun 1, 2009
    I guess you must have an extraordinary good cpu to be able to run it at 2.26Ghz @ .8750V, excellent! You might want to save one more clock frequency to your list (preferable 1.862Ghz @ .8750V) and set the throttling level to medium.

    Did you test these values thoroughly with CPUtest (hyperlink provided with the CoolBook .dmg file)?
  3. vant thread starter macrumors 65816

    Jul 1, 2009
    Yeah, I tested with the recommended settings for over 15 minutes (huge/2instances).

    What would be the purpose of adding another clock frequency?
  4. Lounge Deluxe macrumors regular

    Jun 1, 2009
    I also just had the 2 base pairs saved like you. I then asked the developer if it would bring any benefit to add one or more pairs, and he advised me to add one more pair (preferably in the middle of the already saved ones). Unfortunately he never explained why (he didn't respond anymore) so I just assumed he knows best and added one more pair.

    Are the power savings of CoolBook clearly noticeable on your MBP?
  5. CPPMaster macrumors member

    Jun 12, 2009
    Just a quick, maybe dummy question, for MB AIR , I understand why use CoolBook, but on the 13" MBP, I see no reason for that.


  6. Lounge Deluxe macrumors regular

    Jun 1, 2009
    Do you think that the 13" MBP won't run hot? Or any of the other alu type Apple laptops for that matter?
  7. sporadicMotion macrumors 65816


    Oct 18, 2008
    Your girlfriends place
    Why not just use smcFanControl? I have a couple saved presets if I'm going to be encoding or playing a game. The highest it goes with the fans at 5800 is 69c in performance mode.

    That's how I've ran my last 13" uMB and my 15". Been the same for both.
  8. vant thread starter macrumors 65816

    Jul 1, 2009
    Being able to run 2261MHz / .8750 V is already worth it.

    Imagine the difference in temperature compared to 2261 MHz / 1.0375V.
  9. vant thread starter macrumors 65816

    Jul 1, 2009
    CoolBook is a great addition to smcFanControl. My 13" MBP has gone up to 80C already (before CoolBook). We'll see where it goes with CoolBook installed.
  10. vant thread starter macrumors 65816

    Jul 1, 2009
    If your base pairs have different voltages, I would understand.

    Since both my base pairs have the same voltages, it would be pointless for me to run anything lower than my "lowest stable voltage for the highest frequency".
  11. macchiato2009 macrumors 65816

    Aug 14, 2009
    hi guys

    just installed CB on my new MBP13

    settings are welcomed

  12. Sneakz macrumors 65816


    Jul 17, 2008
    Toronto, Ontario, Canada
    Quick question, can you overclock with coolbook? By setting a frequency higher than the processor's max clock?
  13. macchiato2009 macrumors 65816

    Aug 14, 2009
    no, downclock only

    the idea is to save power when you don't need the proc to fun at full speed, especially for surfing, itunes, typing text, etc
  14. trondah macrumors 6502

    Dec 1, 2008

    2128 MHz @ 0.8750V
    2527 MHz @ 0.9750V

    13" MBP 2.53GHz. Thank God for Coolbook, this thing is (or was) so hot. I discovered some incompatibilities with SL and sent a fix to the dev, shortly after he had a SL beta ready. Writing this on 10A432 and 64 bit kernel :)
  15. netddos macrumors regular

    Oct 22, 2005
    ok well what are some temperature gains?

    how much temperature were you able to drop by using this?
  16. trondah macrumors 6502

    Dec 1, 2008
    I'm now idling at 50C before it was 60C. Max temps have lowered as well it could go over 100 before at extreme load now I'm struggling to hit 90 (testing with mprime95 torture test). Normal encoding "just" hits 80.

    These numbers aren't scientific in any way but before Coolbook it was uncomfortable to have this machine on my lap, now it isn't.
  17. Andrew Henry macrumors 6502a

    Mar 4, 2008
    That's as low as you can go with 2.53 ? I'm at .9000V!

  18. trondah macrumors 6502

    Dec 1, 2008
  19. justaregularjoe macrumors 6502

    Nov 28, 2008
    so CB is a program that lets you undervolt, thus underclock, thus physically cool down your processor? Does undervolting at the same clock speed also reduce temps? And if so, why doesn't Apple do this themselves? That would help us...

    Does this program allow one to overclock? Very interested.
  20. ayeying macrumors 601


    Dec 5, 2007
    Yay Area, CA
    Undervolt is NOT underclock. Big difference here. Also if you undervolt too much, you'll risk corrupting data so make sure backups are done regularly because corruption comes outta the blue.
  21. biiishplz macrumors newbie

    Jul 10, 2009
    Cypress, CA, USA
    I bought my MBP 13, my first Mac, last month, and bought CoolBook a few days later. I've been doing undervolting in Windows for a few years now. A processor's power consumption under load is directly proportional to its clock speed, and proportional to the square of its voltage.

    That said, my P7550 runs 800 MHz-2.13 GHz on 0.875V, and 2.26 GHz on 0.8875V. Trying to select 0.875V @ 2.26 GHz seems okay until I start stress testing, which results in immediate kernel panic. Assuming the processor's nominal TDP at its full stock speed and voltage, this brings the processor's power down from 25W to 15.6W at full bore. 9.4W in such a small space is a big difference. Before, when doing video transcoding, or other processor intensive work, I was seeing 90°C+ after 20-30 minutes. Now, I rarely see it above 70°C, and that's in a room that's hovering around 20°C.

    On the stability front, I did a couple hours of stress testing on the 2.13 and 2.26 GHz speeds, which is usually enough to determine if there are any serious stability issues, but not quite the 12 hours I had done on my desktop PC.
  22. reallynotnick macrumors 6502a

    Oct 21, 2005
    I have mine at:
    1596mhz .875v
    1995mhz .9v
    2261mhz .925v

    I tested mine with "all" and did it 10 times (takes almost 2 hours), then after I got a successful run I bumped the voltage up one setting. So basically this thing is stable as can be.

    OP I would HIGHLY recommend you test your settings more in depth. I had voltages pass on enormous that would not pass on all 10x and you said you only did huge.
    For example I got 2.26ghz to pass at .8875v on enormous but could only get it to pass on .915v on all 10x.

    Basically my CPU used to top out at 100º now it only reaches 80º when encoding h.264 via handbrake.

    Now everyone must remember that all of these settings are different for each CPU so what works for someone might not work for another.
  23. yesnoyes macrumors newbie

    Sep 4, 2009
    I have the same 13" MBP 2.26 GHz. Are these defaults that Apple gives or the default that is set when you click "Default" in the CoolBook GUI? When I installed CoolBook (without registering), it gives me these values:

    798 MHz / 0.8750 V
    1596 MHz / 1.000 V
    1862 MHz / 1.0500 V
    2128 MHz / 1.0875 V
    2261 MHz / 1.0875 V

    Why is there a discrepancy there? My numbers are considerably higher that the ones you posted. Please advise. Thanks.

    Others members with the 13" MBP 2.26 GHz, what are your (Apple) defaults as reported by CoolBook?
  24. vant thread starter macrumors 65816

    Jul 1, 2009
    My GF's 2.26 default is as follows:


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