Why would anyone want to stress their PC further than it already is? Doesn’t it have enough problems? That may be the case, but stress testing can be a vital resource to have in your techie arsenal. Stress tests test the stability of a PC under heavy loads. Stability issues may arise from PC overclocking.

That’s where stress testing comes in. Stress tests ensure the stability of your component part. Although stress tests can also gauge the performance of your PC, that is best left to benchmarks. Stress tests push your PC to its limits. By the time you finish reading this article, you’ll be able to stress test with the best of them.

The Skinny on Stress Testing

Stress tests push your PC’s performance, raising temperature and usage readings to their limits. If a PC passes a stress test, it is considered stable. Unstable PCs will not perform optimally, and may shut down. The automatic shut down feature saves PC components from damage. If a PC does shut down during a stress test, previous overclock settings must be lowered.

These tests can sometimes be misleading. For example, stress testing components may raise temperature so high that the PC shuts down due to overheating rather than instability. In order to accurately stress test your PC, a few monitoring programs are needed.

Monitoring Programs

You will need to monitor your PC temps, voltage readings, and clock speeds to ensure that the process is running smoothly. CPUID HWMonitor provides real-time temperature and clock speed stats to ensure that your PC is running at max performance.

hwmonitor_stress-1

When it comes to all-around monitoring software, MSI Afterburner is tops. Afterburner provides real-time usage and temperature readings, along with controlling the fan speeds of your GPU. This means you can provide real-time cooling by raising fan speeds for your GPU.

afterburner

It also makes for a handy overclocking tool if you’d like to overclock your GPU. Keep careful sight on your temperature readings during a stress test. If your temperatures are reaching 80°C on idle — or under low-stress conditions — then stress testing your parts may overheat your PC before results can be received. If so, consider measures to cool down your PC. Remember to close all extraneous programs beside your monitoring software and stress testing software.

Advice on Stress Testing

Stress testing may seem like a casual process, but proper stress testing requires a careful eye. Before stress testing, make sure to do the following.

1. Ensure 100% Usage

Again, stress tests aren’t used to test your performance. They’re meant to max out your performance. Make sure that your parts, whether it be your CPU or GPU, are being used at maximum capacity throughout the test.

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task_manager_stress-1

This tip may seem overtly simple, but it ensures that you are testing your parts to their full capacity. You can use any of the programs mentioned above to monitor usage. To ensure correct usage readings, use multiple monitoring programs during testing.

2. Double-check Clock Speeds

Ensure that you are stress testing your components with the correct clock speeds. Some software may stress test your PC properly, but display your clock speeds incorrectly. This is where using multiple monitoring programs becomes critical.

overclock_unigine_heaven

Incorrect clock speeds are usually caused by forgetting to save clock speeds or saving clock speeds incorrectly. Clock speeds may also push past their supposed maximum clock speeds, as is the case with Intel’s Turbo Boost technology.

CPU_performance-1

Intel’s Turbo Boost software works by minimizing the performance of some cores to boost the performance of one past its supposed maximum speed setting, offering more on-demand processor performance under certain conditions.

AMD has a similar software called AMD’s Turbo Core which replicates this service.

Features like these may explain conflicting speed readings from your CPU, so ensure that your CPU is running at maximum usage percentage rather than clock speed.

3. Keep Temperatures as Low as Possible

Speedfan allows you to control the different fans in your PC. Increasing fan speeds will lower the overall temperature readings of your PC. It also allows you to keep tabs of which fans are working and which aren’t. Some GPUs run fans all the time, while others do not activate their fans until the GPU is used past a certain percentage.

speedfan_stress

Bump up fan speeds around 70 – 80% if any component reaches 80°C. Also, remember to use multiple monitoring programs to ensure temperature readings. The above example shows my CPU temperatures at 128°C at idle, implying overheating. MSI Afterburner and CPUID HWMonitor, however, indicate that my CPU temps are actually around ~40°C.

Incorrect temperature readings are often a software, not hardware, issue. Most temperature readings are taken from the BIOS, which monitors the real-time temperatures of individual PC components. Monitoring software carefully parses these readings, and displays them in a convenient list. If a software cannot parse these readings or confuses them in some manner — such as adding every CPU core temp reading rather than displaying each one individually or displaying readings in Fahrenheit instead of Celsius — the software will provide false temperature specs.

To uncover false readings, we recommend consulting more than one application.

4. Research Your Components

Before stress testing or overclocking, remember that a wealth of online resources can help you. Doing a bit of research about your components will ease the stress testing process tremendously.

First, research stable overclock settings for your components. Chances are, users have already stress tested and found stable conditions for your component parts. This will dramatically reduce the amount of time necessary to find a safe overclock.

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overclock_online_search

Secondly, research whether it’s safe to overclock your component. For example, K series Intel CPUs allow for easy overclocking. Intel CPUs that are not a part of the K series do not have their clock multiplier unlocked, making them much harder and less safe to overclock.

5. Aim for the Crash

The purpose of stress testing your PC is to push performance to the point of failure. Although a PC crash may seem like a major issue, PC components will shut down before serious harm is done. If you’re overclocking your PC, aim for the crash.

bsod

A PC crash sets clear limits for your overclock. Afterward, underclock your PC to reach stable settings.

Stress Testing Your Components

Now that you understand what stress tests are for and how to monitor components during a stress test, it’s time to stress test your components.

1. GPU Stress Test

A GPU stress test will cause one of two errors. Either your PC shuts down, or you begin to see video artifacts on your screen. Video artifacts are visual breaks in your screen which taint the image you see. These artifacts are usually green or purple, and indicate that your GPU is being pushed past a stable state.

gpu_artifact

Visual artifacts during a stress test indicate that you should lower overclock settings. When it comes to stress testing GPUs, Furmark is a very well-known brand. Furmark was designed to stress your GPU as much as possible. Furmark attempts to render very high quality fur on your PC. When Furmark finishes, you will be given a rundown of your highest GPU temperature and a score rating. You can match this rating with Furmark’s library, comparing your PC usage with others.

furmark_stress_test

Other stress testing software, such as Unigine’s Heaven or Valley software, provide various other methods to stress test your GPU. Some stress testing software will cause your PC to shut down, while others will not. It depends on the amount of stress each software puts on your GPU. Try a few out to ensure that you are stress testing your PC completely. Stress testing GPUs does not take as long as testing CPUs, so a few runs through Furmark should be enough to ensure stability.

2. CPU Stress Test

There is one indicator that a CPU stress test has worked: it crashes. Prime95 is perhaps the most trusted software on the market. Prime 95 is a client of the GIMPS (Great Internet Mersenne Prime Search) program, which attempts to find large prime numbers using your processor. Hence, the prime in Prime95.

prime_95

There are three settings within the Prime95 software. Small FFTs provides a CPU stress test, along with minor RAM testing. In-place large FFTs provides a harder CPU stress test, aiming towards maximum usage and temp readings. Blend aims for more RAM testing than CPU stress testing.

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prime95_options

In-place large FFTs provides the best stress test making it the best choice. If you are new to stress testing, however, I would consider running Small FFTs and keeping track of temperature readings. If your CPU cannot properly maintain its temperatures during this test, In-place large FFTs may overheat your PC.

RealBench also provides an effective stress test for your CPU, and uses realistic actions like photo-editing and video rendering for its testing methods.

realbench_stress_test

The longer the duration of these stress tests, the more likely your PC is to crash. An over-night test in Prime 95 is best for proper results. Running a 3-4 hours test, however, will ensure that your CPU is not unstable and can take on heavy loads throughout the day. OCCT, which stresses your PC as much as these other programs, also provides a handy monitoring interface to keep track of temps, clocks speeds, and CPU usage over time.

3. RAM Stress Test

RAM stress testing serves a similar purpose to stress testing other components, although it is often done to test the factory stability of the components. A malfunctioning RAM module can put serious limitations on your PC and lead to random, frequent shutdowns.

Memtest86 commits thorough tests on your RAM, checking for any errors. If your PC suffers from shutdowns, there is a good chance the RAM in your PC may lead to errors. Memtest86 will locate errors, saving you the possible expense of a completely new PC.

memtest86

Unfortunately, this program cannot run from your regular desktop. You will need to install the program onto a separate flash drive and boot from your flash drive to run Memtest86.

Download the program labeled Auto-installer for USB Key. This simple application will install Memtest on your drive automatically. Once Memtest begins, it will scan your RAM for errors. If Memtest doesn’t find any errors with your installed RAM, your RAM is good to go.

Stress It!

Undergoing a proper stress test after overclocking ensures the performance increase of the overclock and the proper stability of your components. An unstable component can be a daily annoyance, and wear your components to an unusable point. No matter; now you can properly stress your PC with free, simple tools!

Have you ever stress tested your PC? Do you use a particular stress testing software? Let us know in the comments below!

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