Fx8350 core temp higher than socket temp

llKingKongll · Jul 16, 2015

Hey guys first time poster. Love this site! I have a question. I have a FX8350 on a MSI 99fxa-gdV2 board cooled by a H100i. While overclocking to 4.8 jiggahertz, under full load I notice that my socket temp stays right at 62c but my core jumps around 61c to 75c kind of erratically. The program i'm using is Aida64 and I don't want to melt my CPU. I've read that the norm is for the socket to be hotter than the core. I did run Aida for about 4 hours and it was stable. If there is already a thread, could you guys point me in the right direction. Thanks!

Darkbreeze · Jul 16, 2015

Core temps always rise and fall much faster than socket or package temps. At least usually. Core temperatures can rise many degrees almost instantly, while socket temps generally have lower response times. It's normal. As long as your temps don't exceed spec, you're fine.

Aida is not the best method for thermal testing. Prime95 v26.6 and only v26.6, is.

Regardless of architecture. P95 v26.6 works equally well across all platforms. Steady-state is the key. How can anyone extrapolate accurate Core temperatures from workloads that fluctuate like a bad day on the Stock Market?

I'm aware of 5 utilities with steady-state workloads. In order of load level they are:

(1) P95 v26.6 - Small FFT's
(2) HeavyLoad - Stress CPU
(3) FurMark - CPU Burner
(4) Intel Processor Diagnostic Tool - CPU Load
(5) AIDA64 - Tools - System Stability Test - Stress CPU

AIDA64's Stress CPU fails to load any overcloked / ovevolted CPU to get anywhere near TDP, and is therefore useless, except for giving naive users a sense of false security because their temps are so low.

HeavyLoad is the closest alternative. Temps and watts are within 3% of Small FFT's.

Prime95 v26.6: http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

And I'd use either HWinfo (NOT HWmonitor or open source monitor) or Core Temp to monitor temps:

http://www.hwinfo.com/download.php

http://www.alcpu.com/CoreTemp/

damric · Jul 16, 2015

Think about what those actually are.

Socket temperature: a physical thermal diode under on the motherboard that is under the CPU socket. It's not going to be all that precise.

Then there is that "Core Temp" which is actually an interpretation of Tctl calculation data from a register. It's not exactly but sometimes similar to the inverse of "thermal margin", which is precisely when your processor will throttle into a lower P-state.

llKingKongll · Jul 16, 2015

Darkbreeze :

Core temps always rise and fall much faster than socket or package temps. At least usually. Core temperatures can rise many degrees almost instantly, while socket temps generally have lower response times. It's normal. As long as your temps don't exceed spec, you're fine.

Aida is not the best method for thermal testing. Prime95 v26.6 and only v26.6, is.

Regardless of architecture. P95 v26.6 works equally well across all platforms. Steady-state is the key. How can anyone extrapolate accurate Core temperatures from workloads that fluctuate like a bad day on the Stock Market?

I'm aware of 5 utilities with steady-state workloads. In order of load level they are:

(1) P95 v26.6 - Small FFT's
(2) HeavyLoad - Stress CPU
(3) FurMark - CPU Burner
(4) Intel Processor Diagnostic Tool - CPU Load
(5) AIDA64 - Tools - System Stability Test - Stress CPU

AIDA64's Stress CPU fails to load any overcloked / ovevolted CPU to get anywhere near TDP, and is therefore useless, except for giving naive users a sense of false security because their temps are so low.

HeavyLoad is the closest alternative. Temps and watts are within 3% of Small FFT's.

Prime95 v26.6: http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

And I'd use either HWinfo (NOT HWmonitor or open source monitor) or Core Temp to monitor temps:

http://www.hwinfo.com/download.php

http://www.alcpu.com/CoreTemp/

OK I will use prime, but I've read that it is not a fan of fx series processors. Now I feel stupid paying $35 on a program that doesn't stress my chip all the that well. Oh well, you live and learn. I try it when I get off slave duty today. Thanks guys.

Darkbreeze · Jul 16, 2015

It works fine across ALL platforms, as stated above. I've used Prime on probably 100 or more systems that had FX chips, and lot more that didn't. I'm not aware of ANY system it can't be use with successfully to determine thermal tolerances.

Be sure to run Small FFT. NOT large FFT or Blend modes.

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