clock frequency voltages

Discussion in 'Galaxy Nexus Development' started by jeffv2, Jan 5, 2012.

  1. jeffv2
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    jeffv2 Developer Developer

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    Just wanted some people to share their voltages :)

    1250mv @ 1.35ghz
    1200mv @ 1.2 ghz
    1000mv @ 920mhz
    900mv @ 700mhz
    700mv @ 320mhz

    I'm still going lower on the voltages but I'm supprised how far these numbers are from stock
    Anyone else undervolting?
     
  2. cupfulloflol
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    cupfulloflol Senior Member

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    Since I haven't overclocked I haven't undervolted the 1.35GHz slot.

    1175mV @ 1.2GHz
    975mV @ 920MHz
    875mV @ 700MHz
    750mV @ 320MHz

    Still plan on going lower, but so far these voltages have been stable for me.
     
  3. orion2001
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    orion2001 Member

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    I'd be a little careful with pushing undervolts too much. For one, it can and will lead to instability if you get very aggressive (of course, you can bump things back up). But from what I've read over on xda from some of the devs, undervolting too much can lead to issues where the phone may still seem stable but will internally mess some things up and not go into deep sleep correctly or quickly, thus resulting in more battery drain in the long run. Here is what I have managed so far:

    1225mv @ 1.35ghz
    1150mv @ 1.2 ghz
    1050mv @ 920mhz
    975mv @ 700mhz
    775mv @ 320mhz

    Btw, you should also check whether your voltages are actually being applied. Some of the kernels seem to allow undervolting in SetCPU but are actually undervolted by a fixed amount by the kernel developers, and SetCPU changes have no effect on the actual voltages on the processor. An easy way to test it is to drop the 1.2 or 1.35 GHz to something really low like 1000mV and seeing if you have to do a battery pull to reboot your phone (make sure SetCPU isn't set to apply voltages at Boot). I'm using the Jame Bond kernel over on XDA and it definitely allows undervolting as I've had my phone freeze up when I push below 775mV @320MHz
     
    Last edited: Jan 6, 2012
  4. jeffv2
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    jeffv2 Developer Developer

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    Yeah the voltages are definitely being applied set them all to 600mv and it froze up. But I'm well aware of the risks I'm just wondering what people are going down to, my battery life has increased by like 2x. Lol

    Sent from my Galaxy Nexus using Tapatalk
     
  5. orion2001
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    orion2001 Member

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    Ah, good to know. I just wanted to put it out there so someone didn't try to use your voltages right off the bat and then come back here to rage at you for breaking his/her phone ;) Looks like you have a great chip in your phone if you are stable at 700mV @320MHz. 775 is the lowest I could go, and I'm staying at 800mV just to ensure being rock stable. Still, battery life has been awesome. With Wifi on, I still get a little less than 1% per hour drainage overnight. And that is without any juice defender tricks...and all google apps pushing updates/email to my phone.
     
  6. jeffv2
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    jeffv2 Developer Developer

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    370mhz is stable at 600mv lol... I put 370 as the min and Max frequency then did a stress test for around 30 seconds with no errors or freeze ups.. I got lucky with this phone, my old Droid couldn't be undervolted at all

    Sent from my Galaxy Nexus using Tapatalk
     
  7. nuclearbier
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    nuclearbier Member

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    1200mV @ 1350MHz
    1150mV @ 1200MHz
    1050mV @ 920MHz
    950mV @ 700MHz
    800mV @ 350MHz


    Sent from my Galaxy Nexus using Tapatalk
     
  8. sbenson
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    sbenson Silver Member

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    Lean Kernel

    1325mV @ 1350MHz
    1225mV @ 1200MHz
    1100mV @ 920MHz
    925mV @ 700MHz
    850mV @ 350MHz
     
  9. lazarus2297
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    lazarus2297 Member

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    so i have been flashing and doing this stuff for awhile but never really got into undervolting.. I am running axiom 2.4 with his apex kernal (the one that comes with the rom) I have used setcpu in the past (mainly to overclock OG Droid, DINC2)

    I don't mind undervolting if it will help battery life some while not cutting on performance too much..

    can someone either explain or give me a link that would help me better understand undervolting?
     
  10. bwillie
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    bwillie Member

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    I'm still playing around but I'm getting good battery life and no lag so far.

    Th3roy Roms!!!!

    Sent from my Galaxy Nexus using DroidForums: Running Axiom 2.4
     
  11. cupfulloflol
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    cupfulloflol Senior Member

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    http://www.droidforums.net/forum/rescue-squad-guides/47871-overclocking-101-a.html <-- that thread is a general overclocking guide, but hits voltages too. Of course it was designed for the OG Droid, but same basic ideas remain. I haven't actually read it in a while to remember how much details he goes into about voltages. There is much more detailed information out there though, if that doesn't cut it for you.
     
  12. xliderider
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    xliderider Active Member

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    My Gnex is running RootzBoat and I'm using the same kernel as you (Fab's). However, my SetCPU screen does not show the VOLTAGE tab between the PROFILE and ADVANCE tabs. What am I missing? :confused:

    Edit: NVM, I installed the AOSP rom codename android and I now have the Voltage tab.
     
    Last edited: Jan 12, 2012
  13. chewy74
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    chewy74 Active Member

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    What are you running for your governor and min sample rate?



    ________________________
    You had me at herro
     
  14. vicky1377
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    vicky1377 Member

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    I see that you are on Verizon when I looked at your radio version on screenshot. Can you share what kind of battery life are you getting with setup rom and UV settings? In terms of screen time keep awake time and % of CPU used by android os.

    Sent from my Galaxy Nexus using DroidForums
     
  15. sbenson
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    sbenson Silver Member

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    FYI - if you're on this site, you have a Verizon phone.
     
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