andaja,
Respectfully, you're running the wrong Prime95
version, and probably the wrong torture test (Blend), which is why your Core temperatures started OK then went high, and why your Vcore and Core Watts are also high. You're probably running the latest version (29.4), however, the correct version to run is 26.6, and the correct torture test to run is Small FFT's. Here's the problem:
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. Certain other utilities may have similar results.
• Prime95 v26.6 -
http://www.mersenneforum.org/showthread.php?t=15504
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’re overclocked and 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 so Core temperatures don’t reach 85°C. 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.
4th Generation Haswell processors have no AVX offset adjustments in BIOS.
Asus RealBench runs a realistic AVX workload typically within +/- a few % of TDP, and is an excellent utility for testing overall system stability, whether you're overclocked or not. RealBench is also the utility that Silicon Lottery uses for testing CPU stability.
• Asus RealBench - http://rog.asus.com/rog-pro/realbench-v2-leaderboard/
Here’s a sample of
thermal and
stability test utilities shown according to % of TDP at Default BIOS 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 v1.82.0 - Bench - Stress CPU
66% … AIDA64 v5.95.4500 - System Stability Test - Stress CPU
55% … Intel Processor Diagnostic Tool v4.0 - CPU Load
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)
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
All tests will show 100% CPU
Utilization in Windows Task Manager, regardless of actual Workload. Higher TDP tests produce higher Core temperatures. Results will vary according to Microarchitecture, Core count, Cache, Core speed, Turbo Boost, Core voltage, Hyperthreading, Instruction Sets, BIOS versions and CPU microcode.
Intel tests their processors on an open bench, without a case, under carefully controlled conditions at 100% TDP. So when performing your own
thermal test, the goal is to run a utility that will get you as close as possible to 100% TDP, which for your 4670K is 84 Watts.
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. This is also the utility that Real Temp uses to test Core temperature sensors.
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 Intel Burn 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, as the CPU, socket, motherboard, VRM's and power delivery components can heat soak and stabilize.
Shown above from left to right: Small FFT's, Intel Extreme Tuning Utility CPU Test, and AIDA64 CPU Test.
Intel Extreme Tuning Utility is also a fluctuating workload. 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.
Guys, if you'd like to get yourself up to speed on this topic, then check out this Sticky near the top of the CPU's Forum:
Intel Temperature Guide http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
CT
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