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    CPU whine on AC, normal or bad processor?

    Discussion in 'Lenovo' started by ddong, Jun 21, 2014.

  1. ddong

    ddong Notebook Consultant

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    Hello,

    While testing my W520 (with i7 cpu), i noticed that CPU whine on AC. Of course it's not as loud as on battery, but it is present, ALL THE TIME. I have another Thinkpad which is the X230 (with i5 cpu) and i do not hear anything whille on AC.. but also on battery!!

    First, did Intel changed something with the 2013 cpu lines so that it doesn't make any sound while on battery? And second, does the i7 cpu making noise all the time need to be replaced? Please tell me what you think.

    Thanks.
     
  2. ctenc001

    ctenc001 Notebook Consultant

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    While I don't know much about these two machines, I do know its a fairly common occurrence for other computer models. I had a Dell xps 12 that I ended up selling because of a high pitched whine that no one else could hear when it was on battery power. Many people complain about it, but its not a sign of any hardware failure, its just an electrical whine.
     
  3. ddong

    ddong Notebook Consultant

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    Common issue on battery yes, but not on AC..!
     
  4. ctenc001

    ctenc001 Notebook Consultant

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    On the xps 12 it was narrowed down to a piece of circuit board used only when getting power from battery if I recall correctly. I think this issue could just as easily appear on AC for that reason.
     
  5. jedisurfer1

    jedisurfer1 Notebook Deity

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    i think if you turn off some c state you can eliminate this.
     
  6. ddong

    ddong Notebook Consultant

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    Not sure i can do that in Thinkpad bios..? I'll check.
     
  7. jedisurfer1

    jedisurfer1 Notebook Deity

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    there is no bios option for that I use throttlestop for that
     
  8. ddong

    ddong Notebook Consultant

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    Checking C1E box, right? No change with that. Change occurs when i decrease "Chipset clock mod". No effect with clock modulation decrease. Meaning..?