8 Best Tools to Stress Test Your PC (CPU, RAM, GPU, and more)
So you just spent days on days researching, purchasing, and building your perfect new PC. You’ve gone the whole nine yards making sure the entire system is cable managed to a tee, your bright RGB LEDs are installed in just the right spots, and there’s plenty of airflow flowing through the entire system.
You power on your new PC and it seems to be working fine, but you want to make sure it’ll also be perfectly fine when the system has Battlefield loaded at the highest settings while streaming to Twitch for hours on hours.
In order to ensure that there’s no hidden defects, the most important thing to do after building a new PC is to stress the machine for at least 6 hours to ensure at the very least there’s no hidden problems lurking in the CPU, RAM or GPU. Doing the stress test also gives you an idea of how much room there is for overclocking as well. If temperatures are far below thresholds, then overclocking may be an option to improve system performance.
With that said, today we’re going to share eight of our favorite tools for stress testing everything in your new PC. Without further ado, let’s take a look.
Before stress testing the system, the most important thing to have is some sort of way to measure temperatures of the components in your system. While some applications such as AIDA64 or Intel XTU will come with the ability to measure component temperatures, some of the other benchmarks don’t have this ability, which is why it’s important to have something to ensure that Prime95 or Furmark isn’t burning up your brand new components.
One of the best free tools to monitor PC component temperatures is HWMonitor. HWMonitor has a clean, easy to use interface and will provide real time information such as utilization, temperature, clock speed, and power usage of the onboard components.
While each CPU and GPU has its own maximum temperatures, a good rule of thumb is to keep desktop CPUs under 70°C and desktop GPUs under 100°C. Laptop CPUs are designed to run a little warmer, so a good rule of thumb on those is to keep temperatures under 95°C. Unfortunately some laptops aren’t designed properly to handle heavy loads for extended periods of times and may cross into the 100°C level. If this is the case, I’d highly recommend returning the laptop and choosing something else.
CPU Stress Testing
Prime 95 (Free)
For CPU stress testing, one of the oldest and best free CPU stress testing utilities is Prime95. Prime95 essentially utilizes the CPU to find Mersenne prime numbers and in the process, generates a very heavy workload on the CPU. Generally an uninterrupted 6 hour run of Prime95 indicates that the CPU is good and will not have issues over its usable lifetime. However, it’s important to ensure temperatures are kept in a reasonable range.
There are several options when using Prime95 to stress test the CPU. The most intense test is the Small FFTs stress test which stresses the CPU the most ensuring that any possible issues will reveal itself early on. Another good test is the blended test which not only stresses the CPU, but the RAM as well. If you’re limited on time, this is a good way to test both the CPU and RAM at the same time.
AIDA64 is a very comprehensive full system diagnostic utility typically aimed at engineers, IT professionals, and systems enthusiasts. Among other tools, one of the best tools AIDA64 offers is the System Stability Test which has the ability to stress everything from the CPU to RAM to the GPU.
What’s great about AIDA64 however, is that it will tell you if the CPU begins throttling, or slowing itself down when the temperatures are too high. If the CPU throttles, then it’s a good idea to check that the CPU cooler is properly installed, purchase a new cooler, or if you’ve been overclocking, it may be time to reduce the overclock.
RAM Stress Testing
Memtest 86+ (Free)
Among the different components that are stress tested, one of the most forgotten components is the system RAM. Most system RAM that fails will tend to fail early on causing blue screens and inexplicable system restarts.
As such, in order to find out if the memory will cause any problems, the most important stress test to run on a new system is the memory stress test, and the best free tool for the job is Memtest86+. Although Memtest86+ isn’t an application in Windows, Memtest86+ is easily be loaded onto a bootable USB drive via an automatic installer. After Memtest86+ is loaded onto a flash drive, simply reboot the system, set the system to boot from the flash drive with Memtest86+ loaded on and Memtest86+ will automatically start stress testing your RAM. If any issues arise, large red letters will indicate that you should probably return your memory or if overclocking, you may want to back off those overclocks just a bit.
GPU Stress Testing
Furmark is a controversial free GPU stress testing utility as it stresses the GPU by producing a complicated 3D image and when run for an extended period of time, it’s been known to fry some older graphics cards that lacked certain voltage limit protections. These days, these issues are largely gone, but many critics of using Furmark to stress test GPUs claim that because no game will produce such a complicated image for such a long time, other methods of stress testing the GPU is far better and less dangerous.
That said, here at CPCR we believe that every graphics card should have sufficient cooling to ensure the system runs well under any graphical load no matter how unrealistic it may be. As such, we continue to utilize Furmark when evaluating graphics cards in our reviews.
Unigine Heaven (Free)
Although Unigine Heaven is best known as a benchmark rather than a stress test, it functions very well as a stress test as it creates a very realistic load on the GPU and can be looped indefinitely to ensure that no issues are found.
3D Mark (Free/Paid)
Like Unigine Heaven, 3D Mark is best known as a benchmark, but is also a very good indicator of system stability as it heavily taxes the GPU in order to render extremely detailed 3D graphics. Those with the full paid version can also loop the benchmark indefinitely to ensure full system stability when playing games.
System Stress Testing
Intel Extreme Tuning Utility
For those with Intel systems, one of the best free tools to stress test the CPU, memory and GPU is actually Intel’s Xtreme Tuning Utility. This utility will allow users to select which component to stress test, for how long, and it simply does its thing. As Intel XTU is designed for overclocking the CPU, one nice thing about the utility is that it will give information about the CPU such as utilization, frequency, temperatures, and whether thermal throttling was detected during the stress testing.
PC Mark 8 (Paid)
Like 3D Mark, PC Mark 8 is best known as a benchmark, but can also be used to test system stability. Although workloads here are significantly lighter than other stress testing utilities, PC Mark 8 tests every subsystem which allows users to quickly identify if there are potentially any issues that may need to be resolved.