GPU Stress Test

How to use the GPU stress test

• Start test: Runs a 5-second warmup so your GPU can reach full speed, then measures for 5 seconds and shows a score. Press Stop at any time; a run stopped early doesn't get a score.
• Keep running until I stop it: Turn this on to keep the GPU loaded until you press Stop. The score then shows the last 5 seconds, so you can watch for throttling or instability over several minutes.
• Graphics: The graphics processor your browser reports, such as "NVIDIA GeForce RTX 3050". Some browsers only report the maker.
• Speed over time: How fast the GPU is working each second, in billions of operations per second.
• Comparison bar: Places your score in one of four rough bands, from Basic (older built-in graphics and budget phones) to Very fast (high-end graphics cards). It's a guide, not a precise ranking: the bands are anchored on a measured GeForce RTX 3050 scoring about 4,900, with other GPUs estimated from it.

The score is specific to this test. It's great for comparing runs on the same device and browser (before and after cleaning a fan, for example), but it isn't directly comparable with other benchmarks.

Diagnosing GPU problems

• Crashes, freezes, or a black screen: If the device or browser crashes during the test, suspect overheating, an unstable overclock, an insufficient power supply, or a failing graphics card.
• Thermal throttling: With the test set to keep running, a speed that starts high and then steadily drops means the GPU is slowing down to protect itself from heat. That points to inadequate cooling.
• Fan noise: Fans getting louder is normal. Fans that don't spin up, rattle, or grind are not.
• Working device: The test completes, the speed stays steady when left running, and the device gets warm but not alarmingly hot.
• Malfunctioning device: Crashes, driver resets, visual glitches, a steadily falling speed, or excessive heat.