Super Pi is used by a huge audience, particularly to check stability when overclocking processors. If a system is able to calculate PI to the 2 millionth pace after the decimal without mistake, it is considered to be stable in regards to RAM and CPU.
Again we can see how superior the single threaded performance of the i5-2500K is compared to the FX-8120, taking less than half the time to complete this test at stock settings.