#BEST CPU STRESS TEST HOW TO#
#BEST CPU STRESS TEST SOFTWARE#
#BEST CPU STRESS TEST FREE#

Make sure that you close all applications apart from the testing application and monitoring software. So, you don’t want to add more to its problems. Go through them once and get back to this.

#BEST CPU STRESS TEST HOW TO#

But, if you do want to overclock but you aren’t sure exactly how to go about it, we have comprehensive guides on CPU overclocking and also GPU overclocking.

However, if you don’t want to overclock your CPU and just want to test its stability at stock speeds, skip this step.

#BEST CPU STRESS TEST SOFTWARE#

Once you have your monitoring software and the testing application installed and ready to go, we can begin testing! Step 1: Overclock No matter how high your CPU is on the CPU hierarchy, Prime95 will stress it to 100%. In fact, the software is so powerful that now, there’s a new option called ‘Torture Test’ that goes a bit soft on the mathematics so that the stability can be tested for long enough. Temperature, stability - everything is tested. This pushes a CPU to its absolute limits. In a way, Prime95 converts a CPU into a very powerful calculator and asks it to perform tough calculations. Without boring you with the details of what Mersenne prime numbers are, I’ll just tell you that it involves a lot of arithmetic maths… with very large numbers. Prime95 tests a processor by asking it to find Mersenne prime numbers. While a lot of testing applications rely on simulating real-world scenarios like videos and what not to test a CPU, Prime95 goes all math on CPUs.

#BEST CPU STRESS TEST FREE#

It’s free to use and more importantly, it’s brilliant at testing CPUs. This is a far more realistic torture test than spamming 16 AVX threads that reside purely in the CPU caches.Prime95 is by far, the most popular choice when it comes to CPU stress tests. If you want to use real world prime95 to claim stability (this test is going to be harder to pass than realbench 2.56), you need to mimic real world instructions by doing the following exactly as listed:ġ) Prime95 29.8 build 6, smallest FFT, AVX/FMA3 disabled (the newest primes let you disable these options directly in the GUI now), set to 2 below the maximum # of threads on your processor or set it to the max # of threads minus memory channels on your processor (9900K=14 threads, 9700K=6 threads).Ģ) Second instance of prime95, 29.8 build 6, FMA3 disabled, AVX enabled, # of threads=equal to the # of memory channels on your CPU, so K and 9700K, FFT range 512K-8192K (click blend then custom), time to test:0 minutes. ONLY limited users who do advanced number crunching for a living would need to focus on this kind of stability.

This test MUST be passed, because if it fails, it means simply your vcore is too low, and the AVX tests mentioned above will use even more power draw than this (more power draw=more voltage droop=even more instability).ģ) you're seriously limiting your overclock potential if passing small FFT/FMA3 is a criteria for your stability.

These are why these are real world tests.Ģ) Small FFT with AVX disabled is very important as as CPU stress test. The other stress test programs, real world tests like x264 stress test, Blender (BMW, Classroom, others), Cinebench R20 (3600/7200 second loops), and Realbench 2.56 have less power draw because the AVX threads must access main memory. That is the reason why power draw drops off heavily after the 112K FFT range (FMA3 small range has the most power draw at 112K FFT, while AVX oddly enough has the most power draw at 36K-note I did not test 100K and 96K AVX). You do NOT need to be prime small FFT stable (AVX) to claim stability on your computer!Įven Silicon Lottery doesn't do this-they use AVX offsets.ġ) AVX only has equal number of memory access channels as your CPU has memory lanes! Consumer boards are DUAL CHANNEL, meaning that only *TWO* AVX threads can access main memory simultaneously. More than half of the stable systems here would not be stable if they used small FFT FMA3/AVX prime95 for their stress testing! Heat is unmanageable!!ĭo you even know or understand how Prime95 FFT range 4k-112K works? NOTHING crashes my 5 ghz CPU except small FFT AVX prime95 because it either crashes, hardlocks (LinX 35000 sample size 0.9.5) or reaches 115C (with enough voltage).

I don't want to pour 115C into my CPU just to be prime95 small FFT AVX stable at 5 ghz.įind me an application that spams the CPU cache without addressing main memory at all and then maybe I'll care. Click to expand.I'm sorry but this is completely utterly absurd.

Best cpu stress test