OCCT loads every critical subsystem, watches sensors in real time, and produces proof that your machine survives sustained stress—not just idle desktop hours.
OCCT now ships native Linux builds with the full test suite.OCCT (OverClock Checking Tool) is a desktop lab for torture-testing CPUs, GPUs, memory and power paths on both tuned and stock rigs. Enthusiasts, integrators, RMA benches and fleet operators use it to expose thermal, voltage and error margins before production workloads hit the metal.
Dial duration, threads and algorithms per device class. OCCT surfaces single-bit RAM faults, GPU shader glitches and CPU rounding drift long before they surface in games or batch jobs.
Chart temps, rails, clocks and utilization as tests run. The embedded HwInfo engine keeps readings trustworthy and flags thermal headroom violations instantly.
Rank silicon with built-in CPU and memory benchmarks, then export stability seals you can attach to RMA tickets or customer handoff docs.
4
Hardware classes covered
CPU, GPU, RAM, PSU
<1s
Time to first fault flag
Sub-second error surfacing
2
OS builds available
Windows and Linux
24/7
Continuous sensor streaming
Always-on telemetry during runs
20+ years · 70M+ installs worldwide
Whether you chase clocks, fight input lag, or live inside simulators and VR, OCCT gives you repeatable stress recipes tuned for gaming rigs.
See howStability isn't optional. Ideal for PC builders, RMA technicians, and high-performance computing: OCCT has you covered for your infrastructure, employees and customers.
See howComputers play a pivotal role in production chains where interruption is not allowed. Elevate your industrial operations with OCCT's performance and stability solutions.
See howSee 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
Contact
Grab OCCT today and get definitive proof of your hardware stability.
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