Official / Semi Official / Rule of Thumb CPU / Heat Sink Temp Deltas?

Discussion in 'Mac Pro' started by lewnworxx, Apr 21, 2015.

  1. lewnworxx macrumors member

    Mar 19, 2015
    Having just recently upgraded from the stock 4 core 2.4's to the hex 3.46's, and reading the interesting bits about various schools of thermal paste application patterns and whatnot I noticed various folks in the thread commenting on values, and a couple posts caught my eye.

    The gist of the posts was that the temp difference between the CPU's on board sensor and the heat sink's sensor could be an indication of a not so great thermal paste job.

    That being said, there wasn't any sort of guideline as to what to expect, and it never really occurred to me to look for the normal delta between them on the stock CPU's (and from what I've read their own paste applications vary quite a bit).

    I tend to see a 4-6 (C) delta, and in looking at the screenshots of IStatMenus, Bresinks' Hardware Monitor, and Mac's Fan Control that seems to be somewhat in line.

    However is there any sort of stated or accepted value for the delta and at what point does one consider a bad paste job as the cause?
  2. SDAVE macrumors 68040


    Jun 16, 2007
    I battled with this and applied 3 times for dual CPU 2010 mac pros.

    I can tell you that following the Apple Service manual was the best way to do it. I just put a pea sized one (maybe a little bigger than pea) in the middle and applied the heatsink on top. This is the best method imo since this is from the service manual.
  3. lewnworxx thread starter macrumors member

    Mar 19, 2015
    Will give that a spin. Found the ASM..

    So what are you seeing for deltas between the proc and sink?
  4. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    I Follow the ASM method to install my W3690. The delta temp during idle is actually 1 degree C.

    However, from your signature, it looks like you install dual X5690, that could make the difference.

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