Stability Testing Software

Stability Testing Software

After you overclock your CPU or GPU, you need to verify that it is stable. A system that crashes under load is not overclocked, it is broken. Stability testing software pushes your hardware to its limits and checks for errors. If your overclock passes these tests, you can be confident it will not crash during normal use.

Prime95 is the classic CPU stability test. It uses a mathematical algorithm called the Great Internet Mersenne Prime Search to stress the CPU with heavy calculations. The Small FFTs test is the most intense, it stresses the CPU cores and cache but not the memory controller. The Blend test stresses both the CPU and RAM. If your system passes Prime95 for an hour, it is likely stable for most workloads.

OCCT, or OverClock Checking Tool, is more user-friendly than Prime95. It has a graphical interface, customizable test durations, and real-time monitoring of temperatures, voltages, and clock speeds. OCCT can test the CPU, GPU, and power supply separately. It also has a feature called LINPACK that uses Intel's math library for extreme CPU stress, generating more heat than Prime95.

y-cruncher is a newer stability test that is particularly good at finding memory and memory controller errors. It calculates Pi to billions of digits using complex algorithms that stress the CPU, cache, and RAM. y-cruncher is especially useful for testing AMD Ryzen systems because it stresses the Infinity Fabric and memory controller in ways that Prime95 and OCCT might miss.

A good stability testing routine starts with OCCT or Prime95 for CPU testing, then y-cruncher for memory testing, and finally a GPU stress test like FurMark or OCCT's 3D test. Run each test for at least an hour. If any test fails, reduce your overclock and try again. Also monitor temperatures during testing. If your CPU exceeds 95 degrees or your GPU exceeds 85 degrees, your cooling is insufficient.