PSU (Power Supply Unit)

The Computer's Energy Source

Power Supply Unit

A critical component that converts the alternating current (AC) electricity from a wall outlet into the low-voltage direct current (DC) electricity that the computer's internal components require to operate. It distributes power to the motherboard, CPU, graphics card, storage drives, and other peripherals.

AC

Alternating Current

DC

Direct Current

Steps of the PSU

Takes in high-voltage AC current, steps it down, rectifies it into DC, and then regulates the voltage to provide stable and clean power at various required voltages (e.g., +12V, +5V, +3.3V) to different components.

PSU

Minimizes wasted heat

W

Wattage

Wattage (W)

The maximum amount of power the PSU can supply. (e.g., 650W, 750W, 1000W or more)

Efficiency Rating (80 PLUS Certification)

An industry standard that certifies a PSU's energy efficiency. Higher efficiency means less power is wasted as heat, leading to lower electricity bills and less strain on cooling systems.

Types of Efficiency Ratings

Bronze, Silver, Gold, Platinum, and Titanium, with Titanium being the most efficient.

ATX

Advanced Technology eXtended

Form Factor

PSUs come in standard sizes, most commonly ATX for desktop computers.

Modularity

How cables are managed

Non-modular

All cables are permanently attached

Semi-modular

Some essential cables attached, others detachable

Fully modular

All cables detachable. Offer better cable management and airflow within the computer case.