Super Pi is used by many overclockers to test the performance and stability of their computers. In the overclocking community, the standard program provides a benchmark for enthusiasts to compare “world record” pi calculation times and demonstrate their overclocking abilities. The program can also be used to test the stability of a certain overclock speed. If a computer is able to calculate PI to the 32 millionth place after the decimal without mistake, it is considered to be moderately stable in terms of RAM and CPU. However, longer tests with other CPU/RAM intensive calculation programs will run for hours instead of minutes and may better stress system stability. While Super Pi is not the fastest program for calculating Pi, it remains very popular in the hardware and overclocking communities. You can find the latest version of Super Pi here
Benchmark Results: The ASRock X58 Extreme3 takes the top spot over the EVGA X58 motherboard by ~1.5 seconds while calculating 32 million decimal places of Pi.