Coolbook with Rev B?

Discussion in 'MacBook Air' started by nph, Jun 2, 2009.

  1. nph macrumors 6502a

    Feb 9, 2005

    I have read a few isolated postings about people with Rev B using CoolBook.
    If you do that what is the extra battery time you get from your MBA Rev B with CoolBook installed?

  2. Scottsdale macrumors 601


    Sep 19, 2008
    I don't believe it myself. Why wouldn't Apple buy them out if the technology did such wonders? Seriously, I don't believe there is any reason to put Cool Book on a rev B MBA. The original, absolutely, it's a proven solution to much of the problems with the original MBA. It's just plain stupid Apple didn't use the tech on the original once it showed such results in preventing much of the overheating. But, the two MBAs are so very different in terms of component makeup. I just don't see a reason to use it on a rev B MBA. I could be completely wrong, but I just don't get how it could be beneficial.
  3. aaquib macrumors 65816


    Sep 11, 2007
    Toronto, Canada
    Apple didn't take over the company because they don't want their customers undervolting their machine. Many have put CoolBook on the Rev.B and reported a better battery life. Sure, the MBA Rev B doesn't overheat as much as the Rev A, but that doesn't imply that it's useless or wouldn't be nice to have.
  4. Scottsdale macrumors 601


    Sep 19, 2008
    That's just my point... perhaps Apple should be using the tech to undervolt original MBAs themselves to help with the problems. If the tech really worked at improving battery life, again, it would seem like something Apple would do.

    The reason Apple doesn't do it on the rev B is because it doesn't work.
  5. mac jones macrumors 68040

    Apr 6, 2006
    there are operating parameters that Intel goes by and they don't want anyone going outside of them.

    In other words "Use at your own risk", but not with Intels blessing, or Apples for that matter.

    But I would think that by undervolting your effectively turning the chip into a ULV.

    If this is actually what is going on (I haven't a clue) then this is a really desirable modification .(just what we want)
  6. SeanU macrumors member

    Feb 2, 2009
    I wouldn't say you are turning your chip into a ULV one... but it will improve things. The idea is that all Intel chips must work within a certain specified voltage range. They test all chips to make sure they work in that range. Some will work within a wider range... and that is why undervolting works. This is why you must test the stability when you use Coolbook... every chip will have a different threshold.

    As far as why Apple won't do this themselves... do you really think Apple is going to retest the thresholds of every CPU? It would be way too costly. There is no notebook manufacturer I know of that directly supports undervolting. Just because they don't support it, doesn't mean it won't work. It's just like overclocking... accept the risks if you want to tweak... and be aware of the possible ramifications.

    I wrote the author of Coolbook to ask him if he could lower the available voltages even further... but he never responded... based on the success people are having with CB... i think many people could get to even lower voltages.

    Another thing to remember is that the screen backlighting is one of the biggest power draws on the laptop that you have direct control over. Turning the brightness down to the lowest acceptable level is the best way to conserve battery life.


Share This Page