I am trying to undervolt my cpu and i am using realbench as a stress test. Im not sure why but when i run a 1 hr and a 2hr stress test it passes but when i use a 4hour stress test it fails within the first hour? Clearly the system is unstable and i have to up my volts a bit more but why isnt it lasting atleast the 2 hrs(in a 4hr test) before stopping as it passes a 2hrest. Am i wrong in assuming that the long test is just repeated loops of the shorter tests?