What is a power supply and why does wattage matter?

The power supply unit, or PSU, converts wall power into the voltages your PC components use. It powers the motherboard, CPU, GPU, storage drives, fans, and accessories.

A reliable PSU is important because every part of the PC depends on stable power.

Wattage is the maximum amount of power the PSU is designed to provide. A PC with a powerful graphics card needs more wattage than a basic office desktop.

More wattage is not automatically better. The goal is enough capacity for the components, some headroom, and good quality.

Efficiency ratings describe how much power is wasted as heat. Quality also depends on internal parts, protections, cables, and build standards.

A cheap, low-quality PSU can be risky even if the wattage number looks high. For gaming PCs, the PSU should match the GPU's power requirements and use the right connectors.

When buying, check the PSU brand, wattage, efficiency rating, and whether it has the right GPU power cables. When selling, include the PSU model if you know it, especially for gaming systems.

If you plan to upgrade the GPU later, power supply headroom can save you from replacing the PSU at the same time.

Choosing around power supplies is easier when the whole PC is balanced, tested, and matched to the way you actually use it.

• Bronze Level: Ideal for everyday use, school work, office tasks, and light games.
• Silver Level: A strong value choice for popular games and smooth general performance.
• Gold Level: Better suited for higher settings, heavier multitasking, and more demanding games.
• Platinum Level: Built for users who want high performance for demanding games, creative work, or long-term headroom.

Prenew's refurbished PCs are checked before resale, so you can upgrade responsibly without guessing whether the parts work well together.