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    W520 corei7 2720QM - 1 core is throttled under load!

    Discussion in 'Lenovo' started by frogman23, Jan 4, 2013.

  1. frogman23

    frogman23 Notebook Enthusiast

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    Hi all,

    I've been using my w520 for almost 2 years. It ran really great until recenty (these 2 weeks), I noticed that the core 2 & 3 constantly ran 20 degreer higher than core 0 and 1 under stress (i.e. wPrime) - please see img1 below as the screen shot of CPUID that shows the temperature under load.

    In HWiNFO64 (img2) also shows that the core 3 was THROTTLED under stress.

    All cores look fine after wPrime finished (img3).

    Here's the configuration: corei7 2720QM, 1000M, 8GB ram, 500HD.

    I just updated the bios to ver 1.38 in December, I'm not sure whether this is the cause of the 1 core throttle or not.

    Has anyone experienced the same thing? Or does it sound like a CPU failure to you?

    Thanks!!
    Jan


    img1 - CPUID
    CPUid.JPG

    img2 - HWiNFO64 system running wPrime
    HWiNFO64_stress.JPG

    img3 - HWiNFO64 wPrime finished
    HWiNFO64_normal.JPG
     
    frogman23, Jan 4, 2013
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  2. frogman23

    frogman23 Notebook Enthusiast

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    Ok, I've reverted the BIOS to ver 1.36 and 1.32, the same throttling is still happening when running wPrime. Core 2 and 3 are consistently 20c higher than others when under load :confused:

    This really leads me to think there're something wrong with the CPU now ... :(
     
    frogman23, Jan 6, 2013
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  3. frogman23

    frogman23 Notebook Enthusiast

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    I recall that the temperature on all the cores under load was like 85c max before ... and the machine was able to complete wPrime 32M under 10s, now it takes >11s everytime due to the throttling :(

    I've called Lenovo support 2 days ago, they said their safety team will contact me as it sounds like an overheating issue. However, i still haven't recevied any call from them ...

    Is there anyone experienced the same thing before?
     
    frogman23, Jan 7, 2013
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