clgpustress review
A free OpenCL GPU tester with configurable workloads and mismatch reporting.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
clgpustress is a free, GPLv2-licensed desktop utility for stressing OpenCL GPUs on Windows and Linux. It is aimed at people checking graphics-card stability who want configurable tests and a way to detect mismatches. Command-line and GUI versions are available, and devices can be selected by OpenCL platform, device type, or device ID. Its scope is specifically GPU testing rather than broad PC stress testing, so it is a narrower fit for buyers seeking CPU or combined workloads.
The test controls give users room to tailor workloads: settings include workload size, block count, pass and kernel iterations, and work-group size. Four documented GPU modes include local-memory checking and polynomial walking. During a run, clgpustress compares results with previously computed device results and reports mismatches; it stops testing a device when results mismatch. In the GUI, per-device logs can be viewed and saved. These features make error reporting a central part of the utility, rather than just running a sustained graphics load. It suits users comfortable choosing test parameters and interpreting device-specific output.
The project warns that the software may overheat or damage graphics cards, so users should take that caution seriously before running a stress test. Its README says it was tested only on a Radeon HD 7850, and compatibility with other cards may vary. That is a meaningful limitation for anyone relying on broad hardware coverage. Choose clgpustress for focused OpenCL GPU checks and mismatch reporting on Windows or Linux; choose another tool if you need CPU stress tests, memory stress testing, combined workloads, or broader verified compatibility.
clgpustress pros and cons
- Where it wins
- Offers four GPU test modes, including local-memory and polynomial-walking tests.
- Adjusts workload, block count, iterations, and work-group size.
- Reports result mismatches and saves per-device logs in the GUI.
- Where it doesn't
- Tests GPUs only; it does not provide CPU or combined-system stress testing.
- Compatibility may vary; the project reports testing only on a Radeon HD 7850.
- The project warns that testing may overheat or damage graphics cards.
clgpustress fact sheet, pricing and score →
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