Core i7-7700K Overheating?

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Bart_9

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May 30, 2017
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Hello,

I recently upgraded my PC to the Z270 platform, and got myself the Gigabyte Z270X Gaming K5 and Core i7-7700k

The issue is its overheating when running prime95, which it shouldn't (Hits 100C on Core #1 and #4). I am using Corsair H90 Push/Pull configuration. I re-mounted and re-applied thermal paste (bought new) to remove one of the possible causes - no better. The CPU is not overclocked, stock. The MoBo is not overclocking the processor automatically either.

With my previous CPU, it never reached temperatures over 65C - it was an i5-4670 non K.

Note: I am also running the newest BIOS from Gigabyte, which is ver 7a at the moment.

Any clues as to what might be going on?
Thank you in advance!
 
Solution
CompuTronix
Bart_9,

On behalf of Tom's Moderator Team, welcome aboard!

Since i7's have Hyperthreading they run hotter than i5's. Also, as the 7700K has the highest Base Clock and Turbo Boost of any other variant, it runs hottest.

Q: Which version of Prime 95 did you run?

Do not use Prime95 versions later than 26.6 on 2nd through 7th Generation i3, i5 or i7 CPU's, which all have AVX (Advanced Vector Extension) Instruction Sets. Recent versions of Prime95 such as 28.9 run AVX code on the CPU's Floating Point Unit (FPU) which causes unrealistic temperatures up to 20°C higher. The FPU test in the utility AIDA64 shows similar results.

AVX can be disabled in Prime95 versions later...
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CompuTronix

CompuTronix

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Bart_9,

On behalf of Tom's Moderator Team, welcome aboard!

Since i7's have Hyperthreading they run hotter than i5's. Also, as the 7700K has the highest Base Clock and Turbo Boost of any other variant, it runs hottest.

Q: Which version of Prime 95 did you run?

Do not use Prime95 versions later than 26.6 on 2nd through 7th Generation i3, i5 or i7 CPU's, which all have AVX (Advanced Vector Extension) Instruction Sets. Recent versions of Prime95 such as 28.9 run AVX code on the CPU's Floating Point Unit (FPU) which causes unrealistic temperatures up to 20°C higher. The FPU test in the utility AIDA64 shows similar results.

AVX can be disabled in Prime95 versions later than 26.6 by inserting "CpuSupportsAVX=0" into the "local.txt" file in Prime95's folder. However, since Core temperatures will be the same as 26.6, it's easier to just use 26.6. Prime95 versions don't affect Core i Pentiums, Celerons, all Previous (1st) Generation and Core 2 processors, as they don't have AVX Instruction Sets.

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

Here's the typical operating range for Core temperature:

85°C Hot
80°C Hot
75°C Warm
70°C Warm
65°C Norm
55°C Norm
45°C Norm
35°C Cool
30°C Cool
25°C Cold

Q: What's your ambient temperature?

Core temperatures are directly affected by ambient temperature.

Q: Is your Core voltage in Auto?

As you might already know, Auto will apply significantly more voltage than is necessary, which increases power consumption (watts) that in turn increases Core temperatures. You might try using "Manual" settings in BIOS to minimize Vcore, then switch to "Adaptive" settings, which will reduce your Core temperatures.

If you'd like to learn more, then you might want to read this Sticky, which is near the top of the CPU's Forum: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Once again, welcome aboard!

CT :sol:
 
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Bart_9

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May 30, 2017
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Hi, thank you very much for the welcome detailed reply!

I was using the latest version of Prime95, now I have tested with Prime95 v26.6 and there is an outstanding difference. Cores #0, #2 and #3 now are below 75C, however, Core #1 is still at 95C (better than 100C I suppose).

Ambient temperature is 21.3C at the time of testing, with constant flow of air through the room.

Yes, the Core Voltage is on Auto. I will play around with the voltage in manual - or at least try hehe.


All the best
 
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Bart_9

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May 30, 2017
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Stable voltage looks to be 1.225V - temperatures on cores #0, #2, #3 remain under 70C and core #1 hits 85C unfortunately.
Prime95 still running with no errors.

Thank you for your help, its much appreciated!
 
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