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Dramatic increase in temperature i7700K - 5.1

post #1 of 5
Thread Starter 
In January 23 2017 I ordered an i770K - 5.1 delidded.
My cooling is air based on a Noctua NH-U12P SE2.
It was able to overclock to 5.0 using Asus AI Suite 3 automatic optimization.
Temperatures never exceeded 68 C.
However, all of sudden, just like yesterday was ok and today is not, the temperature alarm I had setup to 75 C started to beep when load is full.

Core temp 1.6 even mark highs at 95C!!!

First troubleshooting was to take cooler out and check thermal compound. Paste was normal, no signe of degradation. Cleaned up and re-applied to no effect: temperatures still are insane hot.

Currently I'm considering the possibility that the heat pipes got malfunction (my Noctua is more than 4 years old) and buying an Alphacool Eiswand 360 CPU.

However that is a quite expensive step so before taking it I would appreciate some help pointing to some other possible problems.

Is that possible that the delliding got degraded so fast and need replacement?

Any input is very welcome.
post #2 of 5
Considering this happened in an instant within a day after months of normal usage, one of two things seem the most likely to me.

Heatsink/cooler failure as you mentioned, or temperature sensor failure on the processor. I've had three customers have the core temperature sensors fail on their 7700Ks. Two not delidded, one delidded, but the same behavior across the board- two to four of the cores showing temperatures 25-50C warmer under both at load and at idle after 1-2 months of use. Just seems to happen at a random time out of the blue.

If you're local (United States), you can send the processor to us if you want and we'll test it here again. Contact us via email for more information.
post #3 of 5
Thread Starter 
I really appreciate your fast respond.
Sending the processor to testing is not an option (live in Japan).
Thank you for your offer.
I'm still scratching my head over the Heatsink/cooler failure possibility... I monitored fan activity and they spin as supposed: 500 RPM in idle and spinning up to 1000 RPM under load.
Under heavy load, like video encoding, the heatsink feels warm to touch telling me its pulling heat out of the processor.
Not HOT, just warm. I'm wondering how hot should the heatsink be.
Air coolers like this Noctua are not rocket science thing... fan spinning and heatsink warm and there is no more aspects to fail.
I'm reaching the conclusion that perhaps it actually a sensor failure.
But I'm still feel very uneasy seeing temperature readings of 50+C in idle...
post #4 of 5
How are the temps distributed across the cores, pretty even or inconsistent?

Also, any possibility of getting an actual thermal probe in between the IHS and HSF? Also if you have any old sensor logs, that might indicate differences in measured voltage and current vs. now. If your CPU was drawing less power before under full load, that would indicate *genuinely* higher temps. Long shot, I know.

Herp Derp:
Beyond the thermal sensor reading inaccurately or a HSF failure I offer another possibility: die-IHS thermal compound failure.
If a cooler were mounted over-tightened or the HSF-IHS-CPU-Mobo "assembly" received a physical jolt, air gaps may form. Unless the TIM Intel uses never solidifies(like AS Ceramique), this would create an area of poor thermal conductivity.
For example, I've seen a lot of old laptops with crusty hard-cured TIM have overheating issues resolved just by a cleaning and fresh TIM. Remember though, most laptop CPUs lack an IHS.

What got me thinking was reading on HardOCP about delidded and relidded kaby lake CPUs. A user mentioned he had large core temp differentials due to over-tightening in the past.
post in question: https://hardforum.com/threads/kaby-lake-crap-tim-why.1920268/#post-1042713194
which reminded me of how heat-cured hardened TIM can "break" it's thermal bond.

If warranty is already not a concern, I'd look at de-lidding(not using a razor), and re-lidding with a high-performance TIM. Especially if a cooler change doesn't resolve the issue, and the higher temps are confirmed genuine.

Edited by DesertRat - 4/28/17 at 8:11am
post #5 of 5
It happens as SL said, Kaby Lake seems to be much more prone to this that last generations. Variations in the order of 10C is "normal", but that high values are telling us seems like a bad temp sensor.
Quote:
Originally Posted by DesertRat View Post

How are the temps distributed across the cores, pretty even or inconsistent?

Also, any possibility of getting an actual thermal probe in between the IHS and HSF? Also if you have any old sensor logs, that might indicate differences in measured voltage and current vs. now. If your CPU was drawing less power before under full load, that would indicate *genuinely* higher temps. Long shot, I know.

Beyond the thermal sensor reading inaccurately or a HSF failure I offer another possibility: die-IHS thermal compound failure.
If a cooler were mounted over-tightened or the HSF-IHS-CPU-Mobo "assembly" received a physical jolt, air gaps may form. Unless the TIM Intel uses never solidifies(like AS Ceramique), this would create an area of poor thermal conductivity.
For example, I've seen a lot of old laptops with crusty hard-cured TIM have overheating issues resolved just by a cleaning and fresh TIM. Remember though, most laptop CPUs lack an IHS.

What got me thinking was reading on HardOCP about delidded and relidded kaby lake CPUs. A user mentioned he had large core temp differentials due to over-tightening in the past.
post in question: https://hardforum.com/threads/kaby-lake-crap-tim-why.1920268/#post-1042713194
which reminded me of how heat-cured hardened TIM can "break" it's thermal bond.

If warranty is already not a concern, I'd look at de-lidding(not using a razor), and re-lidding with a high-performance TIM. Especially if a cooler change doesn't resolve the issue, and the higher temps are confirmed genuine.

He bought it delidded. It's in the first line tongue.gif
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[Samsung] 750 EVO 250GB [Western Digital] Green 2TB [Jonsbo] FR-331 RGB fans [Jonsbo] FR-301 Red 
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RGB for days
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The Lady Box
(17 items)
 
CPUMotherboardGraphicsRAM
[Intel] i7 7700K [5.0 GHz @ 1.##v] [Gigabyte] Z270MX Gaming 5 [MSI] 290X Lightning [####/#### @ 1.##v] [A-Data] XPG Dazzle [4*8GB - 3000/16] 
Hard DriveHard DriveHard DriveCooling
[Samsung] 840 EVO 256GB [A-Data] SP900 256GB m.2 [Seagate] 4TB 2.5" ST4000LM016 [Alphacool] VP755 v1 
CoolingCoolingCoolingCooling
[EKWB] Coolstream XE 360 [EKWB] Coolstream PE 360 [Alphacool] NexXxos XP3 Light Acetal [EKWB] FC 290X Lightning 
CoolingCoolingCoolingCooling
[Frozen-Q] Resevoir [Mayhems] UV White tubing 3/8" x 5/8" [Alphacool] fittings all around [NZXT] Aer F 120mm (x6) 
OSKeyboardPowerCase
[Microsoft] Windows 10 [Professional x64] [G.Skill] Ripjaws KM570 [Seasonic] Prime 650W [80+Titanium] [Case Labs] SM5 [Matte White] 
MouseMouse PadOtherOther
[Nixeus] Revel [White] [Frozen-Q] ProMat [NZXT] Hue+ [CableMod] RGB [30cm] 
CPUMotherboardGraphicsRAM
[Intel] i5 7300U (ES) [ECS] KBLU-MINI [Intel] HD 620 [Kingston] Impact 2*4GB 2400/14 
Hard DriveOSMonitorKeyboard
[Transcend] MTS400 128GB [Microsoft] Windows 10 [Professional x64]  [Toshiba] 39" LED TV 1080p [Logitech] K400 
PowerCaseAudio
[FSP] 19v 3.42A brick [ECS] Liva Z Plus [Simple Audio] Listen 
CPUMotherboardGraphicsRAM
[AMD] FX-8350 [Gigabyte] 78LMT-USB3 Rev 5 [XFX] HD 5450 One [G.Skill] Ares, 2*4GB, 2133/10 
Hard DriveHard DriveCoolingCooling
[Samsung] 750 EVO 250GB [Western Digital] Green 2TB [Jonsbo] FR-331 RGB fans [Jonsbo] FR-301 Red 
CoolingOSMonitorMonitor
[Jonsbo] FR-301 White (in PSU) [Microsoft] Windows 10 [Professional x64]  [Samsung] 19" Syncmaster 931BF [Samsung] 19" Syncmaster 931BF 
KeyboardPowerCaseMouse
[Microsoft] Comfort Curve 1000 [EVGA] 550 GS [Jonsbo] VR2 - Black [Microsoft] Optical Mouse 200 
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