What is a PSU (Power Supply Unit)? Explained!
In this guide, we have explained what is a power supply unit, or PSU, along with its types, power connectors, 80 Plus ratings, and more.
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When motherboard and graphics-card manufacturers started powering CPUs and GPUs from separate 12-volt connectors, many older power supplies were still designed to put out a substantial portion of their amperage to 5-volt and eve. That led to widespread advice and articles recommending wildly exaggerated power-supply ratings to cover. Power supplies, as we know them in desktop PCs, go all the way back to the original IBM PC. 80 Plus is a power-supply certification program that guarantees a minimum of 80% efficiency across a wide variety of loads, with different levels offering increased energy savings via reduced PSU waste heat.