M18x r2 Pushing the 3840QM through overclocking?

Discussion in 'Alienware 18 and M18x' started by nobodyserio, Apr 12, 2019.

  1. nobodyserio

    nobodyserio Notebook Guru

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    I read several threads mentioning the results of using the 3940XM even up to 4,6GHZ on a single core (but unstable, it seems).

    Seeing how the 3840QM looks to be almost identical aside from the 100mhz and 10 W difference, I am looking the get the most of a single core ( avoiding damages of course).

    As far as I get everything correctly I should need:
    - Unlocked A12 Bios
    -triple heatsink CPU
    -"better" thermal paste (liquid crystal)
    - proper 330W power unit (of course)

    I havn't overclocked before, but I guess I am supposed to change the CPU values in the Bios little by little checking the tempartures, correct?

    Getting anything over 70(?)Celcius should be avoided and changes reverted, I assume?

    Do any of you have have experience with "healthy" settings that push this CPU for the m18x r2?
    Or should I maybe replace it with a more overclocking freindly CPU ? (3940XM, 2920xm maybe?)

    Thank you for your time
     
    Last edited: Apr 12, 2019
  2. M18x-oldie

    M18x-oldie Notebook Consultant

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    You could just try it and see how far you can get. No unlocked bios needed for OCing the CPU. Just enable an OC profile (recommend to start with #1) and set the values step by step. Do a stress test and temperature check after each change.

    Good paste (and the stronger fan model of the r2) could be very handy.

    Max single core possible on 3840qm should be 4.2 GHz.

    70° is desirable, but around up to 85° when OCed still not that dangerous, imo.

    Liquid metal is a good and handy fellow, but needs special handling and being veeery cautious when applying.
     
  3. nobodyserio

    nobodyserio Notebook Guru

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    Thats a lot simpler than I expected, thank you. Is there any recommended software for setting the profile and stress testing or should I simply run a demanding game or program for tit?
     
  4. M18x-oldie

    M18x-oldie Notebook Consultant

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    The profiles need to be set in BIOS upfront, and then can be fine-tuned with Throttlestop.

    For stressing most people use prime95. I use the stress test of CPUz, also stresses all cores.

    Temps can be checked with Throttlestop.
     
  5. nobodyserio

    nobodyserio Notebook Guru

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    thank you. I will slowly advance step by step and avoid going over 80 Celcius.
     
  6. ssj92

    ssj92 Neutron Star

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    3840QM can be max overclocked to 4Ghz all core.
    It has a 4x turbo multiplier available.

    Point of the extreme is the unlocked multiplier, I can hit 4.7Ghz.

    My 3820qm was limited to 3.9ghz because of the locked multiplier.
     
  7. nobodyserio

    nobodyserio Notebook Guru

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    Wow, 4.7 Ghz is really impressive. For now I am curious in only testing one core use and having 4.7Ghz would exceed my expectations.

    Does it run stable in your case? I guess using liquid metal as thermal paste is unavoidable to reach such levels.
     
  8. ssj92

    ssj92 Neutron Star

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    No liquid metal, IC Diamond. 4.7Ghz requires max fans and good ambient temps.

    I can do up to 4.5Ghz without using max fans but I normally just use around 4.3Ghz.

    You won't get 4.7Ghz even on single core. The 3840QM is locked. You need 3920XM or 3940XM if you want to go higher.

    3840QM can do 4 turbo bins which means:

    Stock:

    1-core: 3.80Ghz
    2-core: 3.70Ghz
    3/4-core: 3.60Ghz

    +4 turbo bins:

    1-core: 4.20Ghz
    2-core: 4.10Ghz
    3/4-core: 4.00Ghz
     
  9. nobodyserio

    nobodyserio Notebook Guru

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    My bad, i misunderstood that part.
    So my option for now are the +4 turbo bins you mentioned. Using Cpu-z and throttlestop ´, in combiantion with adjusting Bios values should do the trick, right?

    If I consider upgrading , would the same procedure be fitting for the 3940xm as well? Just plug and play, adjusting values, no unlocked bios needed?
     
  10. M18x-oldie

    M18x-oldie Notebook Consultant

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    Check my first post above ;)
     
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