majerus.sven :
... AIDA64 hit a peak temp of 74DegC ... IntelBurn Test ... peak temp was around 88DegC ...
majerus.sven,
On behalf of Tom's Moderator Team, welcome aboard!
AIDA64 doesn't have any test combinations that yield conclusive thermal results, and Intel BurnTest can be nearly a 120% workload.
Here's the operating range for Core temperature:
Core temperatures above 85°C aren't recommended.
Core temperatures below 80°C are preferred.
Core temperatures increase and decrease with Ambient temperature.
Guys,
Intel tests their processors at 100% TDP for validating Thermal Specifications.
Prime95 version 26.6 Small FFT's is ideal for CPU thermal testing, because it's a
steady 100% workload with
steady Core temperatures that typically runs Core i variants with Hyperthreading and Core 2 processors within +/- a few % of TDP. No other utility so closely replicates Intel's proprietary test conditions.
Whether
thermal testing or
stability testing, the objective is to run utilities that give you a valid thermal baseline, but won't
overload or underload your processor.
Here’s a table of popular utilities grouped as
thermal and
stability tests according to % of TDP, averaged across five Generations of processors at stock settings:
TDP ...
Thermal Test -
Steady Workload
129% ... Prime95 v27.7 through v29.4 - Small FFT’s (AVX, No Offset)
101%
<-- Prime95 v26.6 - Small FFT’s
89% ... HeavyLoad v3.4.0.234 - Stress CPU
87% ... FurMark v1.19.1.0 - CPU Burner
78% ... CPU-Z v1.83.0 - Bench - Stress CPU
66% ... AIDA64 v5.95.4500 - System Stability Test - Stress CPU
TDP ...
Stability Test -
Fluctuating Workload (Peak)
123% ... OCCT v4.5.1 - CPU: OCCT (AVX, No Offset)
118% ... LinX v0.6.5 - Default
116% ... IntelBurn Test v2.54 - High
113% ... OCCT v4.5.1 - CPU: Linpack (AVX, No Offset)
110% ... AIDA64 v5.95.4500 - System Stability Test - Stress FPU
99%
<-- Asus RealBench v2.56 - Stress Test (AVX, No Offset)
97% ... Intel Processor Diagnostic Tool v4.1.0.24 - Default
94% ... Sandra 2017.09.24.41 - Burn in - Processor Tests
92% ... CineBench v15.0 - CPU - Render Test
79% ... Intel Extreme Tuning Utility v6.4.1.15 - CPU Stress Test
As you can see in the above table, Prime95
version 26.6 is best for
thermal testing. This is the utility that Real Temp uses to test Core temperature sensors.
• Prime95 v26.6 -
http://www.mersenneforum.org/showthread.php?t=15504
Asus RealBench runs a realistic AVX workload, and is an excellent utility for
stability testing. This is the utility that Silicon Lottery uses to test CPU stability.
• Asus RealBench - http://rog.asus.com/rog-pro/realbench-v2-leaderboard/
In the above table, all tests will show 100% CPU
Utilization in Windows Task Manager, regardless of actual Workload. Higher TDP tests produce higher Core temperatures. Power (Watts) and Core temperatures will vary with Microarchitecture, Core count, Core speed, Core voltage, VID, Turbo Boost, Hyperthreading, Instruction Sets, Memory, IGPU, CPU cooler, BIOS versions and Microcode.
• About Prime95:
2nd through 8th Generation i3, i5 and i7 CPU's have AVX (Advanced Vector Extension) Instruction Sets. Prime95 versions
later than 26.6 run AVX code on the CPU's Floating Point Unit (FPU) which causes
unrealistic temperatures
up to 20°C higher due to excessively high TDP workloads, as shown in the above table. Other high TDP utilities have 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. AVX doesn't affect Core i 1st Generation, Core 2, Pentium or Celeron processors since they don't have AVX Instruction Sets.
If you run AVX apps such as for rendering or transcoding, you may need to reduce Vcore and Core speed or upgrade your cooler and case fans to maintain stability and reasonable Core temperatures. Many 6th, 7th and 8th Generation motherboards address the AVX problem by providing offset adjustments in BIOS. An offset of -2 or -3 (200 or 300 MHz) is usually sufficient.
Prime95's default test, Blend, is a fluctuating workload for testing memory stability, and Large FFT's combines CPU and memory tests. As such, Blend and Large FFT's both have fluctuating workloads which aren’t well suited for CPU thermal testing.
Other stability tests such as OCCT have cycles that exceed 120% workload, which again aren’t well suited for CPU thermal testing. However, OCCT will by default, terminate the CPU tests at 85°C.
The "Charts" in SpeedFan span 13 minutes, and show how each test creates distinct thermal signatures.
Shown above from left to right: Small FFT's, Blend, Linpack and IntelBurn Test.
Note the
steady thermal signature of Small FFT's, which allows accurate measurements of Core temperatures.
A steady 100% workload is crucial for thermal testing so the CPU, cooler, socket, motherboard and voltage regulators can thermally stabilize.
Although AIDA64's CPU test is a steady workload, it's far below TDP, which is insufficient for thermal testing. All other AIDA64 CPU test combinations are fluctuating workloads, which again aren't well suited for thermal testing.
You might want to read this Sticky:
Intel Temperature Guide -
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
kgt1182 :
... CPU is still well below the 105°C throttling temperature.
Just to be accurate for our readers, 3rd Generation Ivy Bridge Throttle temperature is 105°C. 4th through 8th Generations are 100°C, while 5th Generation is 96°C.
The correct Throttle temperature for the i5 8600K is 100°C.
Product Specifications: Intel® Core™ i5-8600K Processor -
https://ark.intel.com/products/126685/Intel-Core-i5-8600K-Processor-9M-Cache-up-to-4_30-GHz
CT
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