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    Can anybody HELP me? THX

    Discussion in 'Alienware M15x' started by czapple, Sep 20, 2011.

  1. czapple

    czapple Newbie

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    I have a M15X and I upgrade i7-920xm & 6970M
    But the AC Power adapter with 150W limit the power of My M15X
    I bought a M17X Power adapter with 240W
    but I found it cant output more than 140W(even less than 150W Power adapter)
    Someone told me the DELL limit the electric current （7.7ampere）within bios
    The 150w is 19.5V 7.7A The 240w is 19.5v 12.3A
    ==========
    I found when the GPU & CPU is all 100% running it need 180W power
    So it will reduce the power of the GPU&CPU when i only use 150w ac power adapter
    ============
    can someone unlock the BIOS limit?
    THX a lot
     
    czapple, Sep 20, 2011
    #1
  2. IrateMike

    IrateMike Notebook Geek

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    I'm pretty sure it's limited by the motherboard.
     
    IrateMike, Sep 20, 2011
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  3. czapple

    czapple Newbie

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    how can i unlock the motherboard?
    dose ur M15X meets the problems of the power adpater?
     
    czapple, Sep 21, 2011
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  4. Jdpurvis

    Jdpurvis Notebook Evangelist

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    If you calculate power available (VxA, above), the 240 W adapter can actually deliver 240 watts, so it should be able to deliver the 180 watts you say you need.. Others here have had some success with the 240W adapter in supporting the mx processors and the 6970, but if you look at the 6970 thread, they have been limited by the motherboard. SOme people have measured a draw of as much as 180 watts from a 150 watt adapter (under stress). I expect that the limitation in the motherboard is that its power regulating circuits cannot pass more power, and if you could remove the limitation you might well fry the motherboard. However, I do not have personal experience with the combination, and you would do well to review posts by those who do - notably svl7 and the Revelator. They have multiple posts on this topic in the 6970 thread and in the benchmarking thread.

    One additional note - for gaming, some of the experts here have felt that it was better to not push the CPU quite as hard in order to leave power for the GPU - esp since many games are not very CPU dependent. It's about tradeoffs.

    Sorry to be the bearer of "not so good" news, though the really good news is that the 6970 does work.

    Good luck,

    Joe
     
    Jdpurvis, Sep 21, 2011
    #4