Undervolting - Battery Save without the CPU killer


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  1. IzelTokatl

    IzelTokatl Well-Known Member This Topic's Starter

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    Ok, so im not really as concerned about overclocking the CPU, but since the phone is basically a computer. I am curious if anyone knows how to undervolt the CPU? This can easily be done on laptops with the help of apps like rightmark CPU. Basically you keep the clock speed the same (or overclock it) but you reduce the voltage at each cpu cycle. You do this on a laptop with an application such as rightmark and you continue to undervolt until your system crashes. Which basically means your CPU has become unstable. Then you raise the voltage a few notches back up to the point before the crash and run it for a few days.

    why would anyone care? Well the effect is you keep the same speed (or faster) BUT you use less energy.... which means longer battery times. I've undervolted the last 3 laptops I've had two half the voltage. Now my hunt begins for an undervolt app for Android. The semiconductor manufactures leave a "generic" setting. But, each piece of silicon is different, and came from relatively different parts of a waffer. So some parts can hold up to less voltage without becoming unstable. Hence why one cpu can be undervolted dramatically and others (of the exact same chip set) can barely get undervolted without crashing right away. This is why they leave it at a generic safer voltage.

    anyone have clues?
     

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  2. Demache

    Demache Well-Known Member

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    That would make sense. But as far as I know, there isn't a way to OC the Eris yet, and I'm sure we can't undervolt it without being able to overclock the CPU (I'm sure they are related somehow).

    And they may have it as low as it can go at stock anyway for all we know. The Eris is using an older, less efficient processor and probably can't be as efficient at lower voltages.
     
  3. Wuzabear

    Wuzabear New Member

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    Be careful. More happens than you realize when you change the frequency or voltage of a processor. Its easier than one would think to blow a chip.
     
  4. IzelTokatl

    IzelTokatl Well-Known Member This Topic's Starter

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    No word yet on this, but Ivan has mentioned he's working on undervolting the next version or two of eris Official.
     
  5. scary alien

    scary alien not really so scary Moderator

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    +1 ...heard the same thing too (can't wait!).

    Also, here's a interesting link re. over- and underclocking from Zanfur over at XDA: Overclock Patch and update.zip - xda-developers (warning: brain melting is a good possibility if you read this :D)
     

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