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What does a computer PSU do?

A PSU converts household AC electricity into regulated DC power for computer components.

What does a PSU’s wattage rating measure?

It is the maximum DC output the PSU is designed to provide across its output rails. Wall power draw is higher because conversion has losses.

What does PSU modularity affect?

Modularity changes which cables can be detached for cable management; it does not change the PSU’s available power.

How should you estimate the PSU capacity a PC needs?

Estimate demand from the actual components, check manufacturer recommendations, and allow reasonable headroom for peak loads and planned upgrades.

What is the 24-pin ATX connector used for?

The 24-pin ATX connector provides the main power connection to most desktop motherboards.

What should you do before installing or inspecting a PSU?

Shut down the computer, switch off the PSU, unplug its AC cord, and disconnect external power before opening the case.

What basic checks help diagnose a PC with no power?

Check the outlet, AC cord at both ends, and PSU rear switch. With power disconnected, reseat the 24-pin motherboard and CPU-power connectors.

What does the 80 PLUS label indicate?

80 PLUS indicates tested energy efficiency at specified load levels. It does not, by itself, establish overall build quality, protections, or suitability.

Why must modular PSU cables be model-compatible?

Use only cables specified for that exact PSU model or approved by its manufacturer. Modular cables that physically fit may have different pinouts.

What should you check to ensure a PSU fits the case?

Check the case’s supported form factor and the PSU’s dimensions, length, cable space, mounting pattern, and airflow layout.

What does the 4+4-pin EPS/CPU connector power?

The 4+4-pin EPS/CPU cable supplies processor power through the motherboard’s CPU-power socket.

What is a 6+2-pin PCIe power connector for?

A 6+2-pin PCIe connector supplies auxiliary power to graphics cards with conventional PCIe power sockets.