There were four basic materials that the Egyptians used to build the pyramids: limestone, pink granite, basalt, and alabaster. Each type of material had a diverse use. Limestone had, for the most part, two uses.
To answer your question: The useful lifespan of a CPU is about 3-4 years. My guess on the technical lifespan under full load is closer to 8-10 years if nothing else breaks and takes the CPU with it. The reasons: High Performance Computing Clusters usually keep the computers for 3-4 years.
My oldest computer has lasted for 18+ years, and the PSU died recently (18+ years) and all of the hardware (excluding my 2007 hard drive, and 2007 dvd burner) have been around for 18+ years. I'm just doing some diagnostics on my HSing Tech M912 v1.7 Motherboard & 230W Standard AT PSU to check and see which part is dead.he lifespan of a computer is going to vary. Depending on how often you use the computer and what you use it for is going to factor in the equation. Also, the original equipment of the computer is going to play a big factor.