What Do Power Supply Efficiency Ratings Actually Mean?

When determining an appropriate PSU to use for a configuration, we all know to look to the Power Supply Efficiency Rating, but what exactly is the Power Supply Efficiency Rating telling us? Is an 80 Plus Gold rated PSU really that much better than an 80 Plus Bronze rated PSU? And what does 80% effic

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Power Supply Efficiency Rating Explained

What is Power Supply Efficiency and Why is it Important?

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Efficiency Explained - Debunking Power Supply Myths

Power Supplies, Fixed & Modular PSUs, 300W to 1200W