FurMark 2 is the successor of the venerable FurMark 1 and is a very intensive GPU stress test on Windows (32-bit and 64-bit) and Linux (32-bit and 64-bit) platforms. It's also a quick OpenGL and Vulkan graphics benchmark with online scores. FurMark 2 has an improved command line support and is built with GeeXLab.

FurMark 1 is still there and will be maintained for several more years. FurMark 1 is a very intensive graphics card stress test on Windows 32-bit platform. It's also a quick OpenGL benchmark with online scores.

FurMark is simple to use and is free.