CPU Stress Testing

Remember to have adequate cooling for your CPU when stress testing.

Delid.dk recommends testing both with and without AVX instruction sets. The newest Prime95 will punish your cooling solution, be sure to be prepared.

While AVX is not common, it is used in more and more programs because of its efficiency in completing repetitive tasks quickly. Therefore, it is useful to be "AVX Stable".

How to stress test your CPU:
There is not a single program that can completely test if your CPU is stable or not. It is recommended to use multiple programs. A torture test should take anything from 3-24 hours, depending on how stable you want your computer.

  • Test with Prime95 v26.6 (without AVX) first to find a stable setting. Run it with Small FFT, then blend.

  • Afterward, to find out where you are stable with AVX active it is recommended to do a stress test in the newest version of Prime95. Set your negative AVX offset in bios and start testing both Small FFT and Blend again.

  • When the CPU is both stable in Prime95(without AVX) and with Prime95(with AVX), it is time to test in other programs as only one program will not completely determine if your overclock is stable or not.


Asus Realbench is recommended, as it tests with and without AVX and also tests some memory as well as the graphics card.

The more different stress testing programs that are used the better. Gaming the newest games that support multi-core/threading, AVX and the newest benchmarks i.e Superposition/3DMark will help in finding instabilities.

Notable Stress test programs  to use as well:
IntelBurn Test
Cinebench
AIDA64
Intel Xtreme Tuning Utility
The newest Battlefield games seem to be an excellent test for testing stability aswell.