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.
How Long Do Desktop Computers Last? When you fork out a bunch of money for a new desktop computer, you expect it to last for the long haul, right? The average life span of a desktop computer is about 3-5 years. There are many variables that can reduce the life span though, such as how much you use it and how hard you push it, environmental heat and humidity, dust, and insects. Yes, your computer can really have bugs!