how much can you undervolt an i7 7500u in a stealth?

Discussion in 'Razer' started by Esaelias187, Sep 20, 2017.

  1. Esaelias187

    Esaelias187 Notebook Geek

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    currently i am on core voltage offset of

    -.0.105V

    am i doing it right shall i try -0.110

    ?
     
  2. don_svetlio

    don_svetlio Notebook Virtuoso

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    Most Kaby/Sky CPUs do -100mV. Few that I've seen go higher, though. I'd probably settle at that, especially considering Razer's iffy power delivery.
     
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  3. Vistar Shook

    Vistar Shook Notebook Evangelist

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    If you are not getting any BSOD on load or idle then it is fine. The ULV chips, as in the stealth, tend to accept less undervolt than the bigger brother HQ chips. You can also try undervolting the iGPU, but take it easy...something like 60mV and go from there....maybe up to 80.
     
    Last edited: Sep 25, 2017
  4. Nuke33

    Nuke33 Notebook Geek

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    Ringbus aka Cache voltage is locked to IA/Core voltage in XTU. So if you use XTU you will not get any lower than what the Cache UV limit is.
    But if you would use Throttlestop you can change those two settings independently.
    My 7700HQ can undervolt around 110mv with both locked together. Unlocked I can undevolt the cores to around 140mv.
    Also you should be aware that Cache/Ringbus is the main interconnect of the CPU internally and to your system which tends to cause instability all over the place when undervolted too much. I recommend not to undevolt Cache/Ringbus any more than 100mv.
     
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  5. Vistar Shook

    Vistar Shook Notebook Evangelist

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    So on your Kaby RB you have -100mV on the ring and -140mV on the core? That is impressive, I set mine the same, but I will try increasing the core offset and decreasing the ring offset.
     
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  6. Nuke33

    Nuke33 Notebook Geek

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    Actually I use -63.5mv on the ring and -135mv on the core. -140mv works, but I like to keep a little room for ambient temperature variation.

    Would be interesting to hear your results with a skylake cpu. :vbthumbsup:
     
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  7. Esaelias187

    Esaelias187 Notebook Geek

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    tbh i was on -0.100

    and it was stable but sumehow the computer was slugish
     
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  8. Vasudev

    Vasudev Notebook Virtuoso

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    don't undervolt iGPU and use default value 0.0
     
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