CPU overheating even undervolted !!

[Tudx007]

Ok, so I recently got a Thinkpad T460p ( i7-6700hq) and i decided to undervolt it. When I undervolt for 150mV and do the stress test using prime 95, the cpu temp.  skyrocket to more than 95 °c in less than 1 minutes  so I thought the undervolting is not enough so i try 160mV ( >95 °c) and the same things happen and I quickly stop prime 95 but then the computer froze, later I tried undervolt 155mv ( obviosly it would fry my cpu more than 95° in a few minutes too) 2 times and I also press on the stop button but  in these 2 cases the computer doesnt froze. After that I tried to disable turbo boost and 1 hour stress test at 160mV (155mV should be fine too)  undervolting is fine (max temp 80) but when i tried 170mV ( without turbo boost too)  bsod happen again. What should i do? 

 

Actually if I I disable turbo boost and run at stock voltage , the laptop will already skyrocket to more than 95 °c in a few minutes. If I undervolt it between 155-165( without turbo too) it would stay below 80 degree celcius )

 

I would like to go for the non-software method but I hope that there is anyone who cant help to analyse and tackle my issue before I do the thermal repaste...

[FuzzyLogic]

Have you tried replacing the thermal paste? What are the idle temperatures?

[JakeNTech]

Is it new or second hand? New laptops tend to run quite hot. I would leave it all at stock settings and then not look at the temps, if its still under warranty then return it. If its second hand and you don't care about the warranty change the TIM and make sure that its not clogged up. You have to take into account that some of the readings won't be too accurate. 

[Lurick]

You should not run Prime95, it's not real world performance in the slightest.

[Light-Yagami]

Open that laptop up and repaste it with some high quality thermal paste. 

If your fans can't keep it cool under 100% load even after repasting, the cooling solution isn't good enough.

 

I had to heavily modify mine to keep what CPU running without overheating. It's a 4710HQ underclocked to 2.8ghz locked and -0.90v (max I could get stable)

And it runs around 75C under load. That is after repasting and drilling a hole into bottom of the laptop to get better airflow. 

 

Not every laptop has good cooling. 

[Tudx007]

7 minutes ago, thegreengamers said:

Have you tried replacing the thermal paste? What are the idle temperatures?

Havent try thermal paste and (between 30 to 50 if undervolt for 160mV)

[Light-Yagami]

Also, run AIDA64 instead of Prime95.. much more realistic to day to day use. Prime95 kills even my watercooled 6700K.. it's not a good test for laptops. To heavy imo

[Tudx007]

But why do it freeze when I press stop to cease the operation of prime 95 , I thought it should freeze during the torture test and not when I press the stop button. So far because of the high temp build up ( >95 degree celcius ) everytime at the instant I press on the stop button, it freeze... Anyone have an explanation for it ?
 

[JakeNTech]

2 hours ago, Tudx007 said:

But why do it freeze when I press stop to cease the operation of prime 95 , I thought it should freeze during the torture test and not when I press the stop button. So far because of the high temp build up ( >95 degree celcius ) everytime at the instant I press on the stop button, it freeze... Anyone have an explanation for it ?
 

There could be a number of reasons. I would worry about the overheating issue first though. Synthetic test don't make for accurate readings weather its overclock stability test or temp.  The most accurate reading is always normal use. 

[Vode]

Prime 95 and Laptops don‘t get along.

[Tudx007]

On 10/15/2017 at 3:34 PM, Vode said:

Prime 95 and Laptops don‘t get along.

Then may I know  what would you think is suitable for  stability test on laptop ? 

[Vode]

18 minutes ago, Tudx007 said:

Then may I know  what would you think is suitable for  stability test on laptop ? 

AIDA 64.

 

But it‘s best you don‘t waste your time with this sort of thing. Laptops by design run a lot hotter than desktops and a chip really can handle 100C. The CPU is the last thing that will break in a Laptop. Hard Drives, RAM, Mainboard and the PC just becoming obsolete are all more likely things to happen first. 

 

Also Prime is a worst case scenario beyond all reasonable workloads, especially for a Laptop. You will never come close to anything like it in everyday use.

 

If performace is your concern and not lifespan: You should use your normal programs and see if you have throttling there. If you do and are set on changing it, replace the thermal paste on the CPU and increase RPM on the fans slightly. (You already undervolted, that would be another thing...)