A GPU stress test is long enough when the throughput has settled and you can see whether it holds. A run that ends inside the first boost measures the boost.
- SystemCheck's Standard run gives the GPU raster stage 50 s. A Deep run loops a 30 s pass 3 times, adds CPU and GPU together, and ends with a hot re-test.
- For stability after an overclock or a repair, test for longer than any check that fits in a few minutes, and with the work you actually run.
- Longer is not automatically better: past the point where the curve is flat, more time adds heat and noise, not information.
The short answer
Run it until the curve stops changing, then a little longer to see that it stays there. For a quick health check that is what SystemCheck's 3-minute Standard run is built for. For a card that has just been repasted, overclocked or repaired, use the 9-minute Deep run, then your own games or renders for longer.
Why the first seconds mislead
Graphics chips boost when they start cold, just as processors do, and a cold heatsink absorbs heat before the fans need to move it. Throughput early in a run can therefore be higher than the level the card holds. The stage drops its warm-up from the figures and reports one-second windows timed to GPU completion, so you can see where the curve settles.
What each SystemCheck run gives the GPU
The stage lengths below are the ones the code runs, and the methodology page prints the same values.
- Standard, 3 minutes in all: one 50 s raster pass, then path tracing to the end of the run.
- Deep, 9 minutes in all: the raster pass 3 times at 30 s each, 60 s of CPU and GPU together, soft shadows, path tracing, and a 30 s hot re-test compared with the cold run.
When to run for hours
Overclock and undervolt stability is a different question from health. A setting can pass minutes of load and still fail after an hour of a particular game. For that, run the workload that matters to you for as long as you play it, and watch for crashes, artefacts and driver resets. A browser test cannot read temperatures, so pair long runs with a sensor tool.
Terms used here
Questions
- Is a 10 minute GPU stress test enough?
- For a health check it is usually long enough to see whether the card settles and holds. For overclock stability it is not; test with your own games for longer.
- Can a GPU stress test damage my card?
- A working card protects itself by lowering its clocks when it reaches its limits. A test only adds the load a demanding game does. Stop if you see artefacts, crashes or smell burning.