Weird core i7-4700HQ CPU temp issue (Asus X750JN laptop)

Discussion in 'Asus' started by Trevayne10, Jul 20, 2019.

  1. Trevayne10

    Trevayne10 Notebook Consultant

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    Greetings, NotebookReview peeps -

    This is a weird one - really got me scratching my head.

    I have a 5 year old Asus X750JN laptop (17"), with a core i7-4700HQ CPU (4C/8T), and it's had a very strange CPU temp from day one.

    Under heavy loads (gaming or benchmarking), cores 1,2 and 3 all spike to around 84°C, but core 4 spikes to only around 77°C. In other words, one core of the CPU always runs around 7°C *COOLER* than the other 3, but only when the CPU hits Turbo and goes to 3.4 GHz (all 4 cores show 3.4 GHz).

    When Idle, all 4 cores are around 45 - 47°C.

    I was under the impression that it's usually one core that runs *hotter* than the other 3.

    What gives?

    I've re-pasted this CPU twice now, with Arctic Silver 5 (used the thin "line" method on top of the 4700HQ's die), and I also "pre-tinned" the copper heat sink with AS5 (I always clean off the old thermal compound using coffee filter paper and 91% isopropyl alcohol), and I always observe the 4 screw diagonal tightening pattern on the heatsink.

    Exact same results, both times. One core is always 6° - 7°C cooler than the other 3, but only during Turbo modes.

    Yours At A Loss,

    - Trev
     
    Last edited: Jul 21, 2019
  2. senso

    senso Notebook Evangelist

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    Maybe warped heatsink, making core 4 having a thicker layer of thermal paste between it and the heatsink. If possible, try to lap your laptop heatsink.
     
  3. Trevayne10

    Trevayne10 Notebook Consultant

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    Thanks for the reply and the lapping suggestion, senso - I'm now digging into techniques for lapping the heatsink face. Not for the faint of heart, but worth a shot.

    Thanks again!
     
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