Astrio CPU Tester is a program for CPU stress testing on Windows. In the Test Configuration section the user selects the load algorithm Algorithm from a list of options prime number search matrix multiplication recursive Fibonacci calculation sorting large arrays mathematical operations sine cosine square root SHA-256 hashing Mandelbrot fractal generation or mixed random mode. The program also displays the number of detected logical processor cores and allows enabling an indefinite test mode until the stop button is pressed. In the Live Metrics section real-time data is displayed including CPU Usage in percent with a progress indicator CPU Temperature if supported number of Active Threads elapsed time Elapsed and remaining time Remaining. The test is started with the Start Stress Test button and stopped with the Stop button. At the bottom of the window an Event Log keeps timestamped records of test starts and stops.