ivandanko :
That works fine but the temps are fairly low compared to newer prime95?
Just as it should be, and as expected.
ivandanko,
Sorry you missed the memo. Do
not use Prime95 versions
later than 26.6. Here's why:
Not all loads are created equal. “Stress” tests vary widely and can be characterized into two categories;
stability tests which are
fluctuating workloads, and
thermal tests which are
steady workloads. Intel tests their processors at a
steady 100% TDP workload to validate 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 test conditions.
Utilities that don't
overload or
underload your processor will give you a valid thermal baseline. Here’s a comparison of utilities grouped as
thermal and
stability tests according to % of TDP, averaged across six processor Generations at stock settings rounded to the nearest 5%:
All tests will show 100% CPU
Utilization in Windows Task Manager, which indicates processor resource activity,
not % TDP
workload. Core temperatures correspond directly to Power dissipation (Watts) which is workload. Prime95 v26.6 Small FFT’s provides a true and steady 100% workload, so if Core temperatures are below 85°C, then your processor should run the most demanding
real-world workloads without overheating.
Each test creates distinct thermal signatures. Here's a few examples:
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 key for thermal testing so the CPU, cooler, socket, motherboard and voltage regulators can thermally stabilize.
2nd and 3rd Generation i7, i5 and i3 CPU’s have AVX (Advanced Vector Extension) Instruction Sets. 4th through 9th Generation i9, i7, i5 and i3 CPU’s have
AVX2 Instruction Sets. Prime95 versions
later than 26.6 run AVX/2 code on the CPU's Floating Point Unit (FPU), which is an
unrealistic workload. 2nd and 3rd Generation CPU’s are minimally affected by AVX, but 4th through 9th Generation with
AVX2 may experience Core temperatures
up to 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 Generation don’t have AVX offsets, you can create a BIOS Profile for gaming, and a downclock Profile for AVX apps such as rendering or transcoding. If you don’t use AVX apps, BIOS should still be configured for it, as certain utilities use AVX for stability testing.
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 as they don't have AVX/2 Instruction Sets.
As per Intel’s Datasheets, TDP and Thermal Specifications are validated “without AVX”.
• Prime95 v26.6 -
http://www.mersenneforum.org/showthread.php?t=15504
There's a Sticky at the top of the CPU's Forum you need to read:
Intel Temperature Guide -
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
CT