PSU (Power Supply Unit)

A PSU (Power Supply Unit) converts alternating current from the wall into the regulated DC voltages, mainly 12 V, 5 V and 3.3 V, that computer components use.

Why it matters

An undersized or poor-quality PSU causes random shutdowns, crashes and can damage hardware. Capacity is measured in watts, and efficiency is shown by 80 Plus ratings such as Bronze, Gold and Titanium, which indicate how little power is wasted as heat.

High-end graphics cards can draw hundreds of watts in short spikes.

Quality units also provide protections such as over-current and over-temperature shutdown, which guard the rest of your parts.

Example

CPU:  125 W
GPU:  220 W
Other: 60 W
Total estimate: 405 W
Choose roughly 650 W for headroom

PSUs run most efficiently around half load and have room for spikes.

Common mistakes

• Buying the cheapest unit for an expensive system.
• Choosing a PSU with too few connectors for the graphics card.
• Using old cables from a different modular PSU, which can have different pinouts.

Related

• Motherboard
• GPU
• Thermal throttling

यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.