powerMAX
powerMAX is a CPU and GPU burn-in test
...It helps users uncover stability issues, cooling weaknesses, and power delivery problems by applying maximum, sustained stress to both the processor and graphics card. The utility supports dedicated CPU tests—SSE or AVX—and a demanding GPU 3D rendering test, with the option to run both simultaneously for full-system power load evaluation. Because it does not generate scores or benchmarks, powerMAX is strictly a stress-testing tool rather than a performance comparison utility. The software requires no installation, leaves no system traces, and runs on any Windows system from Windows 7 onward. ...