Cpu test software?

In the overclocking community a rule of thumb is often used to determine how long to run Prime95: test the CPU (8KB FFT) for 10 hours and the memory (4096KB FFT) for 10 hours, and if the system passes, there is a high chance that it is stable. Moreover, a large proportion of system overclockers and enthusiasts favor Prime95 over other benchmarking suites because Prime95 pushes the CPU's floating point units extremely hard, causing the CPU to become extremely hot. Inadequate cooling is the most common cause of Prime95 failing. In addition, Prime95 stresses a computer machine far more than the majority of software based torture-suites. The nature of this is because the operating system usually shuts down the floating-point unit when unused by other programs, whereas Prime95 is well-optimized to continuously and effectively thread the FPU, resulting the FPU to be deeply pipelined thereby generating significantly more heat because of elevated power consumption under the massive workload conditions. In CPUs not properly cooled, errors will occur. Prime95 also constantly accesses main memory up to 60MB per second. This constant activity will detect memory problems that other programs do not.