GPU Stress Test: Check Your Graphics Card's Stability

What this GPU stress test checks

This test keeps your GPU under continuous, heavy load by cycling automatically through five different rendering workloads, 3D geometry, shaders, textures, particles, and volume rendering, switching between them every 25 seconds so no single workload lets the GPU rest. The goal isn't speed, it's stability: does your GPU keep delivering consistent frame times for the full duration, or does performance degrade, stutter, or drop as heat builds up.

If you want to measure raw performance on each of these workloads individually instead, that's exactly what the benchmark your GPU's performance tool is built for. The two tools are related but answer different questions, benchmark for speed, stress test for sustained stability.

How to use the GPU stress test

• Close other GPU-intensive tabs or applications so the load reflects your GPU under this test, not shared with something else.
• Pick a duration, 5 minutes is enough for a quick check, 10 minutes or Unlimited gives a more thorough read on sustained thermal behavior.
• Let it run without switching away from the tab, some browsers throttle background tabs, which would understate the actual load.
• Watch the live FPS graph and stability percentage while it runs, a steady line is what you want to see.
• Stop the test at any time with the Stop button, or by closing the tab.

Stress testing after an overclock

If you've just applied a new overclock, running this test is a reasonable first sanity check. Watch closely for visual artifacts or a stability percentage that drops sharply, both often surface here before anywhere else. That said, for serious, extended validation before committing to a permanent overclock, a longer run with a dedicated native stress-testing tool remains the more rigorous standard, this test is a genuinely useful early warning system, not the final word.

What your results mean

Stability is the number that matters most

The stability percentage compares your minimum FPS against your average FPS during the run. A stable GPU holds close to 100%, meaning its slowest moment wasn't far off its typical performance. A stability reading that drops well below that, especially if it keeps dropping the longer the test runs, is the clearest signal of a GPU struggling to sustain the load, often from thermal throttling as the card heats up.

Dropped frames

A dropped frame is counted whenever a gap between rendered frames runs noticeably longer than expected for a smooth 60fps pace. Some dropped frames during a demanding, continuous test are normal, this is a genuinely heavy synthetic workload. A dropped frame count that climbs steadily rather than staying roughly flat over time is more worth paying attention to than the total by itself.

Visual artifacts, a different kind of warning sign

Stability and dropped frames tell you about performance consistency, but watch the picture itself too. A genuine artifact looks like something that shouldn't be there: unexpected colored specks or pixels, flickering or garbled textures, or strange tearing in the geometry. Seeing this during a stress test is a more direct sign of instability than a dip in FPS alone, and it's worth taking seriously, especially if you're testing after an overclock or suspect a driver issue.

Reading the score

The score at the end combines your average FPS with your stability percentage into a single number, weighted so a GPU that renders fast but inconsistently doesn't score as well as one that renders a bit slower but rock-solid. Treat it the same way as any other browser-based benchmark score: useful for comparing your own GPU over time, after a driver update, or between two of your own systems, not as an absolute rating to compare against someone else's completely different hardware and browser.

Is it safe to run a GPU stress test?

Yes, for the large majority of systems. Modern GPUs have their own built-in thermal protection specifically designed to handle sustained heavy load without damage, throttling clock speeds or, in extreme cases, shutting down before real harm occurs. This test genuinely loads your GPU and produces real heat, the same as any demanding game or rendering workload would, running in a browser tab doesn't make the work any less real. Good airflow around your device and a reasonable session length are sensible precautions, the same as they would be for any sustained heavy graphics workload.

If your system does shut down, freeze, or restart during a long run, that's most often thermal protection doing exactly what it's supposed to do. A shutdown that happens unusually early or under only moderate load is worth investigating further, dust buildup, poor case airflow, or aging thermal paste are common, fixable causes. It's also worth knowing that a shutdown isn't always about heat specifically, if you've recently upgraded your GPU without upgrading your power supply to match, an insufficient PSU struggling to deliver enough sustained power under peak load can cause the exact same symptom.

What this test can't tell you

Worth being upfront about the honest limits here. This test can't read your GPU's actual temperature, browsers have no access to hardware sensors, so if you specifically want a temperature reading, you'll need dedicated hardware monitoring software running alongside it. It also can't push your GPU quite as hard as a native, low-level stress-testing application can, browser tabs carry real overhead and some browsers throttle background activity, so treat this as a genuinely useful stability check, not the absolute maximum load your hardware could ever see. Serious native stress-testing tools also include automatic hang detection, stopping the test the moment a GPU stops responding entirely, a safeguard this or any browser-based test can't fully replicate.

Troubleshooting common issues

• My system froze or crashed during the test. Close the tab to stop the test immediately. If this happens consistently well before you'd expect your hardware to struggle, it's worth checking your cooling and, separately, testing with a native diagnostic tool for a fuller picture.
• My device shut down unexpectedly. This is most often thermal protection triggering. If it happens quickly or under only moderate load, check for dust buildup in your fans and vents and confirm airflow isn't blocked. If your cooling checks out fine, an undersized power supply for your specific GPU is worth ruling out too.
• Stability keeps dropping the longer the test runs. That's a classic thermal throttling pattern, the GPU performs fine at first and degrades as it heats up. Worth checking your cooling setup if this shows up consistently.
• I saw visual artifacts during the test. If you've recently applied an overclock, reverting it and retesting is the first step. If you're running stock settings and still seeing artifacts, check that your GPU driver is current, and if the issue persists, it's worth considering whether the GPU has a developing hardware fault.
• Results seem lower than expected for your GPU. Close other GPU-intensive tabs and applications, and confirm the test is actually using your dedicated GPU rather than integrated graphics if your laptop has both.

If you'd rather isolate what's slowing you down, it's worth taking a moment to check your CPU's stability too, since not every performance issue traces back to the GPU.

FAQ