Undervolting and unleashing the thermal headroom in the Yoga Pro 2

Discussion in 'Lenovo' started by tassadar898, Oct 24, 2013.

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  1. tassadar898

    tassadar898 Notebook Evangelist

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    The i7 best buy version (not sure about others) is very easy to tweak using Intel Extreme Tuning Utility. Much of the sliders are unlocked. I increased my Max turbo power (not just the short burst) to 25W and increased my FPS in SC2 and left4dead2 by 10 fps! I also undervolted across the board on the CPU/GPU by .1V and it seems stable so far. I will test increases in battery life later. You can also overclock the GPU and overvolt the GPU but I prefer to undervolt for better battery life.

    You have to disable Intel Thermal Profiles in the bios i think or it will revert back eventually.
     
  2. crazylilazn

    crazylilazn Notebook Geek

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    I'm not sure why nobody else has responded to you. I'm definitely going to try this later tonight.

    Any reports on whether or not battery life has been increased due to your undervolting?
     
  3. tassadar898

    tassadar898 Notebook Evangelist

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    I havent done any controlled battery run downs. It "feels" like it last longer ;). The fans do seems to kick off less. The real awesome part is i am scoreing p1100 on 3dmark11 which is equivalent to the macbook air with intel HD 5000 with 40EU! Increasing the thermal to 25W really helps
     
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  4. crazylilazn

    crazylilazn Notebook Geek

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    Just ran 3dmark11 with my GPU overvolted by 50mV, and I got p1070! Not bad.

    What're your settings for your undervolt and overvolt, if you don't mind sharing?

    I tried undervolting my CPU by 0.1V but it crashed on me :(.
     
  5. tassadar898

    tassadar898 Notebook Evangelist

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    I dont overvolt. I have the GPU undervolted by .8V and the CPU undervolted by .8V (got a crash at .1V after some use so I dialed it back). The GPU can be overclocked and overvolted but it is not worth it. What is holding the GPU back really is the 15W TDP turbo cap. If you up it to 25W then the performance gets a huge boost. I have tried overvolting and overclocked the GPU to 1400mhz but only got 100 more points on 3dmark11 so about 1200. Id rather undervolt by .8V then overvolt by .5V (1.3V volt difference) for such a tiny performance increase. I am satisfied that I can play SC2 and L4D2 at 1080p.
     
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  6. tassadar898

    tassadar898 Notebook Evangelist

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    what undervolts are you guys achieving?
     
  7. jrcbandit

    jrcbandit Notebook Enthusiast

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    Edit: N/M. There is a clear difference this time, ~25,500 vs 29,600 on Ice Storm 3dmark graphics score with turbo boost changed to 25W.

    Is there anything detrimental to changing Intel Thermal Profiles in bios?
     
  8. cransauce

    cransauce Newbie

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    Which version of XTU are you using? When I try and use the version downloaded directly from Intel it will not install because it is not a supported platform.

    Update: Nevermind, It was an old link i was using, the newest version on intel's page seems to work.
     
  9. tassadar898

    tassadar898 Notebook Evangelist

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    Can someone help me do an experiment to see if undervolting helps with battery life. Someone with stock voltage download a program called BatteryBar it is free. It tells you the discharge rate. Set your computer on the maximum brightness and close all programs. Let it sit idle on the desktop with the balance profile on but the high performance color fix ON. Wait until the battery discharges about 3% to normalize. Then check the discharge rate and report back here. I will be doing the exact same thing with about .16V total decrease to the chip to test to see the discharge rate. By my calculation the CPU should be running about 2W less power with my undervolt. Thanks!
     
  10. tassadar898

    tassadar898 Notebook Evangelist

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    I have done it and do see a different by about 10% but want to get more of a sample size.
     
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