4 Replies Latest reply on May 20, 2016 8:24 AM by Intel Corporation

    i7-6700K cycles hot 62-98deg on 100% load - passes Intel Diagnostic test @5.4GHz!!!


      Hi All,

      My new build rig with i7-6700K CPU seems to run very hot and the temperature cycles between 62-94 degrees (even as high as 98 deg ) when under 100% load.

      I think this imples it is hitting thermal thresholds and backing of speed/voltage or whatever...



      I am running Asus Z170 Deluxe - no overcclocking - no plan to either.

      BIOS - everything set to 'Auto' or Default

      OS Ubuntu 16.04

      Things I have tried:

      1. Reseated the CPU cooler (Cooler Master Hyper 103) several times no effect

           - reseating had little or no effect

      2. Upgraded the CPU cooler to Cooler Master hyper D92 dual fan - very little effect, maybe a couple of degrees (I thought the first was not making good contact)

           - reseated the new cooler - no improvement

      3. Set the CPU Fan to 100% - in case it was fan control loop lag - no effect, still see the cycling

      4. Keep the case open or closed little or no effect

      5. Set Bios to auto default everywhere - no effect

      6. Set DRAM freq to 2133/Auto - no effect





      But then I am at a loss to get the temperature down -

      (I have another i7-3820 it's a 130W chip and it never goes above 74 degrees and doesn't cycle)


      I plan to use this as a number crunching machine rather than games... so stable, heavy duty CPU loading is the objective.


      I thought it was a CPU die to heat spreader heat transfer defect - but it passes Intel diagnostics....

      Any ideas what it could be and how to fix?




      Screenshot from 2016-05-05 13-17-52.png


      In closer detail 3 minutes duration, 1 second updates temperature cycles every ~8-10 seconds

      this was with new CPU dual fan cooler - so a little bit lower peaks

      Screenshot from 2016-05-09 18-22-31.png

      Intel Linux Diagnostic test results.

      I have no idea why it thinks the detected clock is 5.43GHz!!!

      All BIOS settings are no overclock.

      Took a bit of messing about to get Linux Live CD IPDT version working as the instructions are wrong.


      --- Testing Processor 1 ---




      --- IPDT64 - rev ---



      --- Start Time: 05/09/2016 00:28:00---



      --- Skipping Config ---



      --- Reading CPU Manufacturer ---


      Expected --> GenuineIntel

      Detected --> GenuineIntel

      Found --- Genuine Intel Processor ---


      --- Temperature Test ---


      Temperature Test Passed!!!



      Temperature = 63 degrees C below maximum.



      --- Reading Brand String ---


      Detected Brand String:

      Intel Core i7-6700K   4.00GHz



      Brand String Test Passed!!!



      --- Reading CPU Frequency ---


      Expected CPU Frequency is --> 4.00



      Detected CPU Frequency is --> 5.43141


      CPU Frequency Test Passed!!!


      Expected frequency - The highest frequency at which the tested processor was manufactured to operate

      Detected frequency - The frequency at which the tested processor is currently operating

      Power management modes can create marginally higher or lower detected frequency

      than expected frequency. Small variations in clock frequencies are common.


      --- FSB NOT Supported on this Processor ---



      --- Running Base Clock test ---



      Detected Base Clock --> 135

      Base Clock test Pass ---

      ..QPI rate Test not supported..

      ..Skipping QPI rate Test..


      Skipping QPI rate Test



      --- Running Floating Point test ---



      Million Floating Points per Second, MFLOPS --> 547.2

      Floating Point Test Pass ---


      --- Running Prime Number Generation Test ---



      Operation Per Second--> 8.63953e+06

      Prime Number Generation Test Pass ---


      --- Reading Cache Size --- 


      - Detected L1 Data Cache Size --> 4 x 32

      - Detected L1 Inst Cache Size --> 4 x 32


      - Detected L2 Cache Size --> 1024

      - Detected L3 Cache Size --> 8192



      Cache Size Test Passed!!!



      --- Determining MMX - SSE capabilities ---




                  ---        MMX SSE       ---

      MMX  - MMX Supported --> Yes

      SSE  - SSE Supported --> Yes

      SSE2  - SSE2 Supported --> Yes

      SSE3  - SSE3 Supported --> Yes

      SSSE3  - SSSE3 Supported --> Yes

      SSE4.1  - SSE4.1 Supported --> Yes

      SSE4.2  - SSE4.2 Supported --> Yes

      --- MMX SSE - capabilities check complete ---


      MMX Test Result --- PASS

      SSE Test Result --- PASS

      SSE2 Test Result --- PASS

      SSE3 Test Result --- PASS

      SSSE3 Test Result --- PASS

      SSE4.1 Test Result --- PASS

      SSE4.2 Test Result --- PASS

      MMX SSE Testing Passed !!


      --- Determining AVX AES PCLMULQDQ capabilities ---




                 --- AVX/AES/PCLMULQDQ ---

      AVX  - Advanced Vector Extensions Supported --> Yes

      AVX OS Support   - AVX Operating System Supported --> Yes

      AES  - Advanced Encryption Standard Supported --> Yes

      PCLMULQDQ  - Polys Carry-Less Multiply Supported --> Yes

      --- AVX AES PCLMULQDQ capabilities check complete ---


      AVX Compare Test Result --- PASS

      AES Test Result --- PASS

      PCLMULQDQ Test Result --- PASS

      AVX AES PCLMULQDQ Testing Passed !!


      --- Reading Memory Size ---



      Detected Memory Size is --> 62.84GB



      --- Integrated Memory Controller Stress Test ---



      --- Integrated Memory Controller Stress Test Pass!!! ---



      Integrated Memory Controller Test Pass!!!


      ..Platform Controller Hub Test not supported curent chipset..

      ..Skipping Platform Controller Hub Test..


      Skipping Platform Controller Hub Test




      ..Query 3..


      --- Querying for Intel(R) Integrated Graphics Device (IGD) ---

      ..Intel(R) Integrated Graphics Device not supported on this processor..

      ..Skipping Intel(R) Integrated Graphics Device Presence Test..



      --- CPU Load ---



      --- Load Level = 8



      CPU Load Passed!!!



      --- Temperature Test ---


      Temperature Test Passed!!!



      Temperature = 45 degrees C below maximum.



      --- Test End Time: 05/09/2016 00:32:00---




      Cooler Master Hyper D52 dual fan cpu cooler

      Asus Z170-Deluxe

      64GB 3200MHz G.Skill (4x 16GB)

      512GB NVMe SSD

      850W PSU

      NVidia Titan X  (but same problem even if the GPU is removed)