The initial two sections of this chapter delve into the two foundational pillars that have shaped modern computing: CMOS technology and the evolution of von Neumann architecture. Complementary metal-oxide-semiconductor (CMOS) technology revolutionized the design of integrated circuits, allowing for greater efficiency and miniaturization, which are essential for today’s high-performance computing systems. Meanwhile, von Neumann’s architecture established a blueprint for how computers process and store information, influencing everything from personal devices to powerful servers. Together, these innovations have been instrumental in developing the sophisticated computing systems we rely on today. The third section provides a comprehensive analysis of demand distribution within data centers, with a particular emphasis on power demand models for servers. This part of the chapter elaborates on methodologies for generating analytical models to estimate power requirements during both idle and active operational states. It takes into account various components that significantly contribute to power demand, such as multi-core processors, random access memory (RAM) modules, hard disk drives (HDDs), solid-state drives (SSDs), and network interface cards (NICs). By examining these components, the section aims to present a holistic view of how each element affects overall power demand, thereby enabling more efficient energy management strategies in data center environments. This understanding is crucial for optimizing performance and sustainability in modern computing infrastructures.