System Stability Tester tries to test the system's stability by calculating up to 128 millions of Pi. The calculation algorithm is the Quadratic Convergence of Borwein. The testing process includes the creation of two or more threads. After each step of the calculation, the results of all the threads are compared. Any differences between them are reported. There is also the option for single threaded calculation, but in this case there is no stability check. This is useful for benchmarking purposes only. The calculation of Pi itself is multi threaded since version 0.7.2.