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...
Higher time resolution 1s samples, 1 minute across. CPU Fan on 100% set in bios not always so neat cycles:
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
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?) psensor indicated temp 3 minutes horizontal scale 1 s resolution (the fan was cycling too): Terminated the stress process...
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): No dome parallel to the direction of the heatpipes or on aluminium part (light shielded to help see). but across/perpendicular heatpipes a bit of a gap...
Addendum5 - Changed the heatsink - a Double Fan Hyper D92 Still running hot and temperature cycling...
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.
Addendum8: Got a new upgraded CPU cooler - marginal improvement in temperatures... but still cycling. My setup:
- 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---