OCCT allows you to thoroughly monitor, test and certify your system, ensuring a comprehensive assessment of its stability.
OCCT is available on Linux!OCCT (OverClock Checking Tool) is a powerful diagnostic and stability testing application designed to test and monitor the stability of overclocked and stock computer systems. It is widely used by PC enthusiasts, system builders, RMA technicians and industrial operators to push hardware to its limits and ensure reliable performance under heavy loads.
Test CPU, GPU, RAM and power supplies with customizable parameters. OCCT quickly detects even the slightest errors and instabilities across all system components.
Monitor temperatures, voltages, frequencies and system load in real time. Integrated Hwinfo engine delivers accurate hardware diagnostics with intelligent overheating alerts.
Compare CPU and memory performance with built-in benchmarks. Generate shareable stability certificates as definitive proof your system passed rigorous testing.
4
Component types tested
CPU, GPU, RAM, PSU
<1s
Error detection
Fastest instability alerts
2
Platforms supported
Windows and Linux
24/7
Monitoring uptime
Real-time sensor tracking
20 Years, 70M+ Downloads
Devoted overclocker, competitor requiring unwavering stability, simulation fan, or virtual reality enthusiast, OCCT is designed to cater to your needs.
Learn MoreStability isn't optional. Ideal for PC builders, RMA technicians, and high-performance computing: OCCT has you covered for your infrastructure, employees and customers.
Learn MoreComputers play a pivotal role in production chains where interruption is not allowed. Elevate your industrial operations with OCCT's performance and stability solutions.
Learn MoreSee why millions choose OCCT over generic stress testers and basic system monitors.
| Capability | OCCT | Prime95 | FurMark | HWiNFO | AIDA64 |
|---|---|---|---|---|---|
| CPU + GPU + RAM + PSU testing | Yes | CPU only | GPU only | Monitor only | Partial |
| Integrated real-time monitoring | Yes | No | Limited | Yes | Yes |
| 3D adaptive GPU testing | Yes | No | Static | No | No |
| Stability certificates | Yes | No | No | No | No |
| Report comparison tool | Yes | No | No | No | Limited |
| GPU compute / OpenCL stress | Yes | No | No | No | No |
| Linux support | Yes | Yes | No | Yes | Limited |
| Completely free | Yes | Yes | Yes | Free tier | Paid |
Rated 5.0 out of 5 by the community. Over 70 million downloads and counting.
"Best overclocking tool I have ever used. The monitoring integration and detailed reports make troubleshooting hardware issues straightforward."
"I use OCCT on every custom build before shipping to customers. The stability certificates are a professional touch that sets my shop apart."
"The 3D adaptive testing caught GPU artifacts that FurMark missed entirely. OCCT is now my go-to for any GPU validation workflow."
"Report comparison saved me hours diagnosing a throttling issue. I spotted a misconfigured memory timing in seconds that took days with other tools."
"Linux support is a game changer for our data center burn-in process. Same reliable testing suite across our entire fleet."
"GPU compute testing validated my AI training rig before I committed to a week-long model run. Caught a failing card immediately."
There's Something for Everyone
Every edition is free. Pick the workflow that matches your hardware validation needs.
For enthusiasts and gamers
Free
For builders and technicians
Free
For data centers and industry
Free
For large-scale deployments
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Download OCCT today and get definitive proof of your hardware stability.
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