Furmark
GPU STRESS TEST OPENGL AND VULKAN GRAPHICS BENCHMARK WINDOWS - LINUX
... extreme conditions.
FurMark from Geeks3D is a free OpenGL benchmark tool for Windows that can also be used to check the stability of a graphics card thanks to a built-in stress test. Furmark rendering is designed to overheat the GPU making it a viral-like stability and stress test tool (also called GPU burner) for the graphics card.