History of Computer Power Supplies
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Power supplies are often an easily-forgotten component of a computer build, but they've actually changed quite a bit over the years. Thanks to Braintree for supporting our channel. To learn more, and for your first $50,000 in transactions fee-free, go to braintreepayments.com Follow: twitter.com Join the community: linustechtips.com License for images used: creativecommons.org
Historically, computer power supplies were a niche concern, often chaotic and incompatible across systems. The video explains that early PSUs delivered limited power and used a variety of form factors, sometimes even mounting directly to computer cases and lacking standard pinouts, which made upgrades and maintenance frustrating for technicians. It then highlights the pivotal shift brought by the ATX standard, introduced by Intel in 1995, which unified form factors and pinouts to create a more modular, affordable, and competitive market. The ATX standard not only stabilized physical dimensions but also pushed for better efficiency and more sophisticated power delivery, including the shift from primarily 5V rails to robust 12V rails supported by voltage regulation modules. Over time, power supplies evolved to accommodate increasing GPU power demands, introduced new derivatives like SFX for compact builds, and adapted to EPS and other form factors for servers and slim towers. The result is a mature ecosystem where high-quality, standardized PSUs are broadly interchangeable, safer, and more capable than their early predecessors. In short, the history of PSUs tracks a move from bespoke, risky designs to a standardized, efficient, and modular backbone of modern computing.
Topics · science · technology
Questions answered
- Why did the ATX standard become important for PC power supplies?
- ATX unified form factors and pinouts, making PSUs easier to fit, cheaper to produce, and more interchangeable, while driving improvements in efficiency and power delivery.
- What major shift occurred in PSU power rails as CPUs and GPUs evolved?
- There was a move from supplying most power on the 5V rail toward providing more current on the 12V rail, with voltage regulation modules producing lower voltages for components.
- What are some PSU form factors mentioned besides ATX?
- Derivatives like SFX for compact builds and EPS for servers were mentioned, along with continued use of variants compatible with ATX motherboards.