Update: Upgraded BIOS to 1801 - CPU got hotter 70-75degC!!

Disabling Turbo Mode in BIOS stopped the cycling (BIOS 1702) CPU temp ~65-69degC.

Already changed the CPU (with upgraded dual fan cooler) and different heatsink compound. Passes the Intel tests in Windows - but still hot and cycling in Ubuntu running stress or stress-ng.

Has anyone else seen that on Ubuntu 16.04?

Unless I got a second not-so-good CPU... or does stress or stress-ng overload the CPU (it doesn't on my older i7-3820)?

Still a problem after installing new, 2 fan CPU cooler, making sure everything auto in BIOS, not overclocking. It passes Intel Diagnostics (output below some 29-45 degrees below max!) - but still cycles between 62- ~94deg (up to 98) on 100% CPU load...

My new build Ubuntu PC seems to have high temperature cycling (and fan speed cycling) when testing using "stress -c 8" - load up 8 threads/cores. stress does load up to 100% but the temp and fans then start cycling a bit...

psensor temp plot 5mins@1s resolution Higher time resolution 1s samples, 1 minute across. CPU Fan on 100% set in bios not always so neat cycles: enter image description here

Has anyone noticed similar characteristics?

Is this indicative of a problem? - poor heatsink compound connection?

Or should I be looking at the 'average' temperature which I visually estimate about 75-80deg ?

I have tried setting the fan thresholds in bios but still see same thing.

Thanks

xc

Addendum1 - deleted, no problem on other i7.

Addendum2 - pictures of the extracted heatsink and CPU: CPU after heatsink removed enter image description here

Heatsink enter image description here

OK I think that pretty much demonstrates the heatsink wasn't making good contact with the CPU top....

Addendum3: Removed, cleaned, applied new/more heatsink compound... But still no cigar...

This time 8 processes @100% Note psensor is quite high CPU load on this new i7 6700K @40% compared to 1.2% on my old i7 (speedstep or something?) enter image description here psensor indicated temp 3 minutes horizontal scale 1 s resolution (the fan was cycling too): Terminated the stress process... enter image description here

Addendum4: Opened it all up again to take a closer look at the heatsink - a steel ruler and backlight...

No sign of a dome on the CPU... (checked with a mirror too to see right down at level and at different places): enter image description here No dome parallel to the direction of the heatpipes or on aluminium part (light shielded to help see). enter image description here but across/perpendicular heatpipes a bit of a gap... enter image description here

Addendum5 - Changed the heatsink - a Double Fan Hyper D92 Still running hot and temperature cycling... enter image description here

Is it a problem with 'stress' - cycling the loading? and 'psensor' - has high CPU load (40%) on Ubuntu 16.04?

Addendum6: Here's my i7 3820 (a 130W CPU!) for reference with stress -c 8 - it only ever reaches 74deg after a short while. enter image description here

Addendum8: Got a new upgraded CPU cooler - marginal improvement in temperatures... but still cycling. enter image description here My setup:

Addendum9 - BIOS settings enter image description here enter image description here enter image description here enter image description here enter image description here

  • All new, no dust, ambient ~26-28deg
  • i7 6700K - no OC (no plan to either)
  • Z170 board
  • Cooler Master Hyper 103 CPU fan (running ~50-100% speed - not 0 as in the graph)
  • New Cooler Master Hyper D92 Dual fan CPU cooler
  • 2 intake and 1 exhaust case fan

sensors gives (a few secs of ~6X deg and a few secs of ~8X deg):

$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +27.8°C  (crit = +119.0°C)
temp2:        +29.8°C  (crit = +119.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +65.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:         +65.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:         +64.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:         +63.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:         +62.0°C  (high = +80.0°C, crit = +100.0°C)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM

$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +27.8°C  (crit = +119.0°C)
temp2:        +29.8°C  (crit = +119.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +86.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:         +86.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:         +81.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:         +81.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:         +80.0°C  (high = +80.0°C, crit = +100.0°C)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM

$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +27.8°C  (crit = +119.0°C)
temp2:        +29.8°C  (crit = +119.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +86.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:         +86.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:         +81.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:         +81.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:         +80.0°C  (high = +80.0°C, crit = +100.0°C)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM

$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +27.8°C  (crit = +119.0°C)
temp2:        +29.8°C  (crit = +119.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +87.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:         +87.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:         +83.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:         +81.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:         +80.0°C  (high = +80.0°C, crit = +100.0°C)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM

$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +27.8°C  (crit = +119.0°C)
temp2:        +29.8°C  (crit = +119.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +87.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:         +87.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:         +83.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:         +81.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:         +80.0°C  (high = +80.0°C, crit = +100.0°C)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM

$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +27.8°C  (crit = +119.0°C)
temp2:        +29.8°C  (crit = +119.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +66.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:         +66.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:         +64.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:         +64.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:         +64.0°C  (high = +80.0°C, crit = +100.0°C)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM

--- Testing Processor 1 ---

--- IPDT64 - rev  2.20.0.0.L.MP ---


--- 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 --- 


         --- CPU FEATURES DETECTION FOR ---
                ---        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 --- 


         --- CPU FEATURES DETECTION FOR ---
               --- 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---
  • What heatsink compound did you use? Did you notice or alter the machining striations on the botton of the heat sink before applying it as-is, because the metal to metal can be improved some, with a bit of elbow grease (work), prior to install. Hate to ask for more visuals, but selecting the CPU activity in the graph would tell something, and having a "frequency" , "clock" , or "cpuvoltage" being shown would also tell things. The top of intels cap/spreader on the cpus is slightly domed normal, it can assist in reducing the M-M connection. Nothing you show is terrible, could be improved first. – Psycogeek May 5 '16 at 13:19
  • 1
    I see you have solved your problem. Be a good Q&A user, ask a question, then submit an answer to that question. Questions that contain the answers are not helpful in my opionion. – Ramhound May 5 '16 at 15:06
  • 2
    New photos... No apparent dome in the CPU, or in direction of the heatpipes on the heatsink... – xcxc May 5 '16 at 17:21
  • 1
    Curiously it says the detected clock is 5.4GHz!!! and I'm not overclocking... everything set to auto in bios... – xcxc May 9 '16 at 13:45
  • 1
    My first impression is that you're completely in the wrong territory trying to solve this. Such an extreme variation in temperature seems bizarre, poor cooling would not produce this cycling, it would just make your CPU heat up gradually. perhaps your motherboards sensors or the CPU itself are failing. I would try the same CPU in a different motherboard. – user576053 May 9 '16 at 18:42

I have the same board, cpu and bios version and the same insane 80+ core temps. To get much lower temps, try changing the CPU core/cache voltage from Auto to Adaptive and leave the new optios on Auto. For some reason the default Auto CPU voltage setting feeds a lot of voltage.

Using adaptive mode the max voltage was 1.2V@4.2GHz while keeping the highest core temps in the 55-65 degrees range running AIDA64 stability test.

Hope this helps!

  • OK I will give this a go! – xcxc Jul 1 '16 at 18:40
up vote 0 down vote accepted

SOLVED - sort-of. UPDATE upgraded BIOS - it got hotter.

I disabled Turbo Mode in the BIOS - and everything became stable and lower temperature (65-69deg) at 100% CPU load.

[I have already re-seated the CPU cooler, upgraded the CPU cooler, returned the original CPU and got a new CPU without resolution]

enter image description here

To verify here is Turbo Mode enabled again:

enter image description here

Upgraded BIOS to 1801: Seems to run even hotter now!:( enter image description here

Turbo Mode - default Enabled "This item allows you to automatically set the CPU cores to run faster than the base operating frequency when it is below the operating power, current and temperature specification limit" - according to the Asus Z170 Deluxe user guide.

But this is a i7-6700K, it is supposed to be over-clockable without such grief!

  • possible that your chip was "binned" incorrectly and should have been an i5 or something. It should not be performing that poorly just from turbo boost. Have you tried a different OS? – Blaine Jun 28 '16 at 0:46
  • Hi Yes I tried Win10 and it passed the Intel test - however it seems the Intel Porcessor test was too old a version coming out before this processor so the results are not to be believed. I could run it very hot using the torture mode in primes (like 100deg in windows!!) - sorry I can't remember exactly the test program. – xcxc Jul 1 '16 at 18:40

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