The name OCCT comes from OverClock Checking Tool. This application will let you benchmark and overclock your system components. OCCT is the most popular all-in-one stability check and stress test tool available.

It generates heavy loads on your components while checking for errors, and will detect stability issues faster than anything else. OCCT embeds HwInfo's monitoring engine to get precise readings and diagnose issues faster.

Can I use OCCT to benchmark my CPU and GPU?

OCCT is primarily a stress test tool used for checking stability issues. With this program you can stress test your CPU, GPU and determine the memory usage on your system. You can configure the app to stop the test when the temperature is too high or when it finds any error so you can prevent hardware failures.

How long does it take to run an OCCT benchmark?

With OCCT you can run stability tests on your hardware from one minute to as long as ten hours. However, it is advisable to stress test your CPU for at least an hour.

Is OCCT free?

OCCT is free for personal use, but some features such as the Stability Certificate are reserved for paid users. For commercial use there are paid versions that start at $5 per month that include more features such as unlimited time duration.

Features

  • Up to 16-core support ( for instance, up to a Quad-Kentsfield or an Octo-Conroe )
  • Customizable tests ( Duration, Priority, CPU or RAM, ... )
  • CPU and Motherboard detection
  • Monitoring support through 3rd party application ( i.e. MBM5, Speedfan and Everest Ultimate Edition 3.50 or above )
  • Can produce graphs showing temperature and voltages during the test : Unique feature !
  • Multi-language support

Don't let your work go to waste

Ensure your computer is stable before working on your beloved projects - don't let a reboot or memory corruption put your hard work to waste

Is this a game bug or my computer?

Find out by stress-testing your components. If anything's wrong, OCCT will pick it up and tell you ! By having a wide-range of test integrated, you'll be able to pinpoint which one is faulty.

Stop wasting time with after-sale services

Find out which component is faulty and gain time by giving after-sale services proof your hardware is faulty. I don't promise you it'll go smooth, but at least, you'll have backup.

Modern monitoring dashboard

Create easy-to-read, attractive monitoring dashboards showing how your component is behaving in real-time.

Check your cooling

OCCT test will make your components go all out. If anything is wrong with your cooling, you'll quickly know.

The ultimate CPU test

OCCT's CPU test gives you full control on which core is tested - Cycle through cores, know which one generated an error, invert them... Lots of fun there.

Squeeze every MHz of your components

OCCT will help you pinpoint ideal values for your overclocked components and ensures rock-stable day-to-day usage.

What's New

  • Main: Revamped the communication between the test for reactivity and robustness. It also paves the way for the upcoming Linux edition
  • Main: Introducing the "Combined" test allowing you to launch several tests in parallel - some make a lot of sense, some don't ( Running CPU and Memory at the same time is a BAD idea as they will compete for resources - using CPU + RAM is advised )
  • Main: Greatly improved OCCT's startup time, especially on older setups
  • Main: OCCT will now do its best to work around some silly antivirus locking temp files or purging them before use.
  • UI: Updated the underlying technology of the UI ( Major update if there's any ) which led us to reimplement a lot of stuff - paving the way for the future. CPU Usage of the UI is lower than ever
  • UI: Updated brand identity and looks for the UI, to reflect our new brand identity. OCCT has never been looking so amazing !
  • UI: You can now chose between Direct3D and OpenGL as a renderer option. Direct3D is the default, but suffers from flickers with Nvidia cards due to a bug in either Nvidia drivers or Windows that hasn't been fixed for more than a year now. It's the same bug as Chrome. You can switch to OpenGL to avoid those, but the UI will use more RAM sadly.
  • Monitoring: Updated Monitoring Engine
  • Monitoring: Added VRAM usage support to the top monitoring bar