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.
May 9, 2012, 7:36 PM. Cpu's usually last 7-10 years on average, however other components usually fail and die out long before that. May 9, 2012, 7:38 PM. No doubt the CPU is one of the most solid parts of a machine. It sits pinned down usually all nice and cooled and protected it's whole life.