zdtaft,
We actually have a Guide that covers this topic. It's a "Sticky" near the top of the CPUs Forum, so if you look you can't miss it. Read the entire Guide, but pay close attention to
Section 11 - Thermal Test Basics:
Intel Temperature Guide -
https://forums.tomshardware.com/threads/intel-temperature-guide.1488337/
It's not a good idea to run any version of Prime95 using AVX.
The latest version of Prime95 is 29.8, which allows you to easily disable all AVX selections by just clicking on the boxes.
• Prime95 v29.8 - https://www.mersenne.org/download/
Click on the boxes for AVX2 and AVX to
disable those
AVX codes. Run only
Small FFT's. 10 minutes is more than adequate to give you a valid thermal baseline.
The following is from the Guide:
"Prime95 v29.8 Small FFT's with
all AVX selections disabled)is ideally suited for testing thermal performance, because it conforms to Intel's Datasheets as a
steady 100% workload with
steady Core temperatures. No other utility can so closely replicate Intel's thermal test workload."
"
• AVX - Advanced Vector Extension (AVX) Instruction Sets were introduced with Core i 2nd Generation CPU’s, then AVX2 with 4th Generation and AVX512 with later Generations of High End Desktop (HEDT) CPU’s as in certain X-Series, Extreme, i9’s and i7’s. Running versions of
Prime95 with AVX enabled imposes an unrealistic 130% workload which can adversely affect stability and severely overload your CPU. 2nd and 3rd Generations are less affected, but Core temperatures on 4th through 9th Generations may be
over 20°C higher.
Many 6th through 9th Generation motherboards address the AVX problem by providing “offset” adjustments (downclock) in BIOS. -3 (300 MHz) or more may be needed to limit Core temperatures to
85°C. Since 4th and 5th Generations don’t have AVX offsets, you can create individual BIOS Profiles for AVX and non-AVX software. Except for a few utilities and specialized computational apps,
AVX intensive real-world apps (rendering, transcoding) and recent games with AVX shouldn’t exceed Prime95's test workload without AVX.
As per Intel’s Datasheets, TDP and Thermal Specifications are validated “without AVX”. In Prime95 versions from 27.7 through 29.4, AVX can be
disabled by inserting
CpuSupportsAVX=0 into the
local.txt file, which appears in Prime95's folder after the first run. However, since Core temperatures will be the same as
29.8 without AVX, it's easier to just use 29.8. You can also use
26.6 which doesn't have AVX. Core i 1st Generation, Core 2, Pentium and Celeron processors don't have AVX Instruction Sets, so they're not affected."
"Here's the nominal operating range for Core temperature:
Core temperatures above 85°C are not recommended.
Core temperatures below 80°C are ideal.
Core temperatures increase and decrease with ambient (room) temperature."
CT