FurMark

FurMark is a GPU stress testing tool that pushes graphics cards to their absolute thermal and power limits by rendering a complex fur-covered 3D object in a loop. It is widely used by overclockers and hardware reviewers to verify GPU stability and measure cooling performance under worst case conditions.

What it does

The stress test renders a torus (donut shape) covered in millions of individually calculated fur strands, forcing the GPU to sustain maximum load for as long as the test runs. A real time temperature graph at the bottom of the window tracks how hot the card gets, while clock speed and power consumption readings let you see whether the GPU is throttling. Running the test for 15 to 30 minutes without crashes, artifacts, or driver resets is generally accepted as proof that an overclock is stable.

FurMark also includes preset benchmarks at standard resolutions from 720p to 4K. Each benchmark produces a numerical score you can compare against other cards on the online leaderboard. This makes it useful not just for stability testing but also for quickly verifying that a new or used GPU performs as expected for its model.

Who it is for

I run FurMark every time I adjust GPU clocks or voltages, because if the card survives 20 minutes of the fur donut without artifacts, it will handle anything I throw at it in games. I also use it after repasting a GPU cooler to confirm the new thermal paste is making proper contact. If you build PCs, overclock, or buy used graphics cards, FurMark is the fastest way to find out whether the hardware is actually stable. It is a blunt instrument by design, and that is exactly why it works.