CPU overheat on 3 cores only

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Moha__

Commendable
Mar 7, 2016
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Hello everyone,

I have a brand new Acer Predator Helios 500, GTX 1070 and i7 8750H

I have a problem where my cpu overheats on 3 cores only hit like 98C and other 3 cores around 80. I will post a picture of it doing prime95 stress test. Can you guys tell me what would be the problem so when I send it to Acer tell them what to do cause apparently they don't know what to do... already sent it 3 times for the same problem ( note: last time they changed the thermal paste and updated the bios settings ) but still this happens. Would it be the heatsink ?


here is the picture of my core temps after running Prime95 stress test

https://ibb.co/37ZbNpy
 
Solution
CompuTronix
Moha__,

The processor is throttling on both versions of P95, which is not good. Moreover, it's still way out of spec concerning Core to Core thermal deviations.

Instead of using HWMonitor, download and run HWInfo:

• Hardware Info - https://www.hwinfo.com/download.php

HWInfo is highly recommended, is very accurate, and shows more advanced monitoring details, such as any Cores which may be reaching throttle temperature. Select "Sensors Only".

As helpstar suggested, you need to RMA that laptop for a complete replacement, as a cooling pad won't solve severe deviation problems or bring them into spec. A cooling pad can reduce the temperatures on all Cores about equally, but again, it won't correct deviations.

As I...
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I'm planning to ask them to change it but they keep saying that the laptop is fine and you need to lower your settings .. meh , GTX 1070 to play on low settings,, what a service. anyways, here's another picture of prime95 with max fan speed and max cpu power in predator sense.

https://ibb.co/qN2s3cK

note that the air coming out of the cpu heatsink is cold compared to the air coming from my gpu when its at 50C even while playing the witcher on ultra settings. the gpu doesn't go above 55C at all. even stress testing.
 
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tell them it keeps shutting down because its too hot. those temps look way too high even on a laptop.

 
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I ve seen other similar instances with Acer laptops as well. Obviously their cooling design is not up to par for such powerful processors. It;s predecessor, Helios 300 with the 7700 HQ had cooling issues as well. Underclocking/undervolting is not a fix, but rather a bypass of the actual problem which will lower your cpu performance. Real gaming laptops allow bios tweaking and have decent cooling design.
My suggestion, ask for a replacement or even a refund.
 
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Unfortunately, they have probably locked down thermal control where the cpu will just throttle to avoid cpu Tmax and shut down.
 
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I know that laptops are not the best for cooling but when I saw most of the reviews for this laptop, the maximum one of the owners had was 91C after gaming for a long time auto fans, I'm not saying this laptop's cooling is the best, but I know owners of the helios 500 who never got above 75C on their cpu. I found undervolting only increases performance no temp decrease. I wouldn't be happy underclocking my cpu cause I could just buy a cheaper laptop. so I will mention that if they don't replace it, I want a refund. I just wanted to know why would the temps go that high on 3 cores only and stay around 80, 78 and 81 on the other 3 cores while stress testing or gaming all I can imagine as normal user is a heatsink problem.

thanks
 
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Q: Which VERSION of Prime95?
Q: Which torture test?
Q: What is your ambient temperature?

Throttle temperature for the 8750H is 100°C: Intel® Core™ i7-8750H Processor - https://ark.intel.com/products/134906/Intel-Core-i7-8750H-Processor-9M-Cache-up-to-4-10-GHz-?q=i7%208750H

Intel’s specification for Digital Thermal Sensor (DTS) accuracy is +/- 5°C: 8th and 9th Generation Intel® Core™ Processor Datasheet, Volume 1 - https://www.intel.com/content/www/us/en/products/docs/processors/core/8th-gen-core-family-datasheet-vol-1.html

See page 95, Section 5.1.5.2.1 - Digital Thermal Sensor Accuracy (Taccuracy)

This means when equally loaded, deviations between the highest and lowest Cores can be up to 10°C. Deviations on processors that have an uneven application of TIM might exceed 10°C by several degrees.

IF you ran Prime95 (non-AVX) version 26.6 (Small FFT's is a steady-state workload), then all Cores were equally and fully loaded.

As per Intel’s Datasheets, Thermal Specifications are validated “without AVX”.

See page 87, Section 5.1.1 - Thermal Considerations, first paragraph.

Since your 8350H's hottest Core is 98°C and the lowest Core is 81°C, the deviation is 17°C. As Intel's spec allows for 10°C and the processor has been re-TIM'd by the laptop's OEM, it's still 7°C out of spec. You therefore have solid grounds for an RMA replacement.

CT :sol:
 
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1_ Prime95 v29.4
2_ Small FFTs heat test
3_ around 20-25C Idk exactly


sorry but I didn't understand the " an RMA replacement " and yeah the differences are way more than 10C in a different test the lowest was 78C and highest 98C that's a 20C difference with max fans, they keep saying that those temps are fine and your laptop is working fine. it doesn't shutdown cause its not designed like that so I don't even know how to prove they should replace ,, Idk how they are working in laptops service ,, meh,, any way that can help me prove this cpu is bad or whatever .. ?

Thanks
 
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lMoha__,

(1) Prime95 v29.4 is not the proper version. Never run any versions of Prime95 later than 26.6. Here's why:

Your CPU has AVX (Advanced Vector Extension) Instruction Sets. Prime95 versions later than 26.6 run AVX code on the CPU's Floating Point Unit (FPU), which is an unrealistic workload that can cause Core temperatures to be up to 20°C higher. As per Intel’s Datasheets, Thermal Specifications are validated “without AVX”.

Version 26.6 is a non-AVX version. Download it then re-test your laptop.

• Prime95 v26.6 - http://www.mersenneforum.org/showthread.php?t=15504

(2) Small FFT's is correct for thermal testing.

(3) Standard or "normal" room temperature is 22°C or 72°F. 20 to 25°C is 68 to 77°F, which is a wide range. Ambient room temperature affects all computer temperatures.

"RMA" means Return Merchandise Authorization, so you can return your laptop for a complete replacement. Just use the text and Intel links I posted above as proof, along with your screenshots.

CT :sol:
 
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@compuTronix

I did the test using the version 26.6 and here's the picture I took while running the test , at the beginning, core 2 jumped to 98 and core 0 to 95, the rest were only around 80 beside core 4 88, and then all dropped as shown in the picture, the test was still running.

https://ibb.co/0K68cj2

I used AIDA64 extreme and the laptop shutdown after less than 3 mins ,, so I uninstalled it. What about the Prime95 26.6 results now ?
 
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Moha__,

The processor is throttling on both versions of P95, which is not good. Moreover, it's still way out of spec concerning Core to Core thermal deviations.

Instead of using HWMonitor, download and run HWInfo:

• Hardware Info - https://www.hwinfo.com/download.php

HWInfo is highly recommended, is very accurate, and shows more advanced monitoring details, such as any Cores which may be reaching throttle temperature. Select "Sensors Only".

As helpstar suggested, you need to RMA that laptop for a complete replacement, as a cooling pad won't solve severe deviation problems or bring them into spec. A cooling pad can reduce the temperatures on all Cores about equally, but again, it won't correct deviations.

As I stated in my first post, Intel’s specification for Digital Thermal Sensor (Core temperature sensors) accuracy is +/- 5°C. This is straight out of Intel's Datasheets. Here it is again:

8th and 9th Generation Intel® Core™ Processor Datasheet, Volume 1 - https://www.intel.com/content/www/us/en/products/docs/processors/core/8th-gen-core-family-datasheet-vol-1.html

See page 95, Section 5.1.5.2.1 - Digital Thermal Sensor Accuracy (Taccuracy)

This means when equally and fully loaded, if the highest sensor is on the upper edge of spec at +5°C, and the lowest sensor is on the lower edge of spec at -5°C, then the deviations between the highest and lowest Cores can only be 10°C.

Deviations on processors that have an uneven application of TIM or a geometrically defective cooler surface (not flat) might exceed 10°C by several degrees. Since the processor has already been re-TIM'd by the seller, and the hottest Core is 98°C with the lowest Core now at 79°C, the total thermal deviation is 19°C.

As Intel's spec allows for 10°C, it's still 9°C out of spec. You do indeed have solid grounds for an RMA replacement. Don't let them jack you around; they simply need to replace your laptop. Use the text explanation and the link to Intel's Datasheets I posted above as proof, along with a new screenshot using HWInfo instead of HWMonitor. Put all the information on your phone and take it with you.

CT :sol:
 
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Solution
Thank you all so much, I will do what you said and I hope they listen and do it. I'm gonna print those things and put it as well when sending the laptop. I'm gonna write down everything you said with the printed pages and info.

Thanks you guys once again.
 
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