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.
IBM PCD introduces the industryâs first notebook with an extended battery life of up to 11 hours. IBM PCD introduces its ThinkCentre desktop PC line. IBM PCD introduces its Active Protection System, the industryâs first notebook with an airbag for hard drive and data protection in case the system is dropped. IBM PCD ships its 20-millionth ThinkPad notebook PC. IBM PCD introduces its ThinkCentre desktop PC line.