Collection: Desktop Power Supplies

The right wattage depends on the components in your build. Add up the TDP (thermal design power) of your CPU and GPU, then add approximately 50–100 W for the motherboard, RAM, storage and case fans. Choose a PSU rated around 20–30% higher than this total to run in the efficient 50–80% load range. For a gaming build with a mid-range GPU, 650 W is usually sufficient; a high-end GPU may push the requirement to 850 W or beyond. Online PSU calculators can help you get a more precise estimate based on your exact component list.

80 PLUS is an energy efficiency certification that guarantees a PSU converts at least 80% of the AC power from the wall into usable DC power at three load levels (20%, 50% and 100%). Higher tiers — Bronze, Silver, Gold, Platinum and Titanium — achieve progressively better efficiency figures. A more efficient PSU wastes less energy as heat, runs cooler and quieter, and costs less to operate over time. For most desktop builds, 80 PLUS Gold offers the best balance of performance and price.

A non-modular (fixed) PSU has all cables permanently attached to the unit. This keeps costs lower but means unused cables must be bundled and hidden inside the case, which can restrict airflow. A semi-modular PSU has the essential ATX and CPU cables fixed, while all other connectors are detachable — this is the most popular option for a clean build without extra expense. A fully modular PSU has every cable detachable, giving you complete flexibility to use only what you need and simplifying cable management in larger cases.

Yes — an oversized PSU will not damage your components, since a PSU only draws the power the system actually demands, not its maximum rated output. However, running a high-wattage PSU at a very low load (below 20% of its rating) can push it into a less efficient operating range, increasing energy waste and potentially causing instability with some designs. For the best efficiency and longest lifespan, aim for a PSU whose rated capacity is roughly 1.25–2× the actual system load at peak draw.

A modern gaming build typically requires: a 24-pin ATX connector for the motherboard, one or two 4+4-pin EPS connectors for the CPU, one or more PCIe power connectors for the GPU (6-pin, 8-pin, or the newer 16-pin 12VHPWR connector used by recent high-end GPUs), SATA power connectors for storage drives, and Molex connectors for older peripherals. Before purchasing a PSU, check the power connector requirements listed in your GPU and motherboard specifications to ensure compatibility.

Yes. A PSU that fails in a damaging way can send unregulated or overvoltage power to your components, potentially destroying the motherboard, GPU, CPU or storage drives. This is why protection features such as OVP (over-voltage protection), UVP (under-voltage protection), OCP (over-current protection) and OTP (over-temperature protection) are important specifications to look for. Always choose a PSU from a reputable brand with these protections built in, especially when protecting a high-value build.

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