clgpustress

At a glance

• Editor score
  6.2 / 10
• Pricing
  Free plan
• Best for
  OpenCL GPU testing with mismatch reporting
• Free plan
  Yes
• Paid from
  None
• CPU stress testing
  No
• Facts checked
  5 Oct 2026

• 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.

Our verdict on clgpustress

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.

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clgpustress pricing

clgpustress fact sheet

Alternatives to clgpustress

• OCCTBroad component testing for PC stability, with free personal use and paid reporting options.8.9
• BurnInTestBroad component testing with bootable runs and exportable reports, sold by one-time license.8.9
• AIDA64AIDA64 pairs PC stress testing with detailed sensor monitoring and business network tools.8.7

See all clgpustress alternatives →

Featured on iTechGuides

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 21 Oct 2026 · How we research and update