PC power supplies in our range are mostly ATX units for desktop builds, together with SFX and TFX models for small cases and some server power supplies. They suit anyone building a PC, replacing a failed unit or upgrading for a new graphics card. Brands include Seasonic, Thermaltake, Cooler Master and Chieftec, alongside system makers such as Dell and Lenovo.
How to choose a PC power supply
Wattage. Add up the maximum draw of the processor and graphics card, then choose a unit rated comfortably above that total. The graphics card maker's recommended PSU wattage is a sensible starting point, and spare capacity helps if you plan to upgrade later.
Efficiency rating. The 80 PLUS label shows how much mains power reaches your components rather than being lost as heat. Our range includes Bronze, Gold, Platinum and Titanium units, with Gold the most widely listed. Higher tiers matter most for machines that run for many hours a day.
Cabling. Fully modular units let you plug in only the cables you need, which keeps a case tidier and helps airflow. Non-modular units have every cable attached, which is fine in a roomy case where most of them will be used. Both types are available, and a few semi-modular units sit in between.
Form factor and compatibility. Standard ATX fits most desktop cases, while SFX and TFX are made for small-form-factor and slim builds. Server units, including 2U types, must match the specific server model, so check the part number before ordering. South African mains is 230 V, which is covered by units marked 100 - 240 V as well as those rated for 220-240 V or 230 V.
Connectors and fan. Count the SATA, Molex and PCIe power connectors your drives and graphics card need. Fan sizes in our range run from 8 cm to 14 cm, and a larger fan can usually move the same air at lower speed, which tends to be quieter.
PC power supply brands we carry
- Seasonic: a specialist power supply maker, known for high-efficiency units with Gold, Platinum and Titanium ratings.
- FSP Group: one of the largest power supply manufacturers, also supplying other brands.
- Thermaltake: known for PC cases and cooling, with a long-running range of ATX power supplies.
- Cooler Master: best known for coolers and cases, and also offers PSUs to match its builds.
- Chieftec: a Taiwanese maker of cases and ATX power supplies.
- Inter-Tech: a German brand covering PC cases and power supplies for standard desktop builds.
- ASUS: offers power supplies designed to pair with its motherboards and graphics cards.
- Dell, Lenovo, HP Enterprise and HP Inc.: system makers whose units are mainly replacements for their own servers, workstations and desktops.
Also in our range: Acer.
PC power supply FAQ
How many watts do I need for my PC?
You need a unit rated above the combined maximum draw of your components, mainly the processor and graphics card. Check the recommended PSU wattage for your graphics card, then allow some headroom for drives, fans and future upgrades. An oversized unit is not harmful, but it adds cost without much benefit.
Is an 80 PLUS Gold power supply worth it?
It is worth it for a PC that runs many hours a day or draws high power under load. Gold units waste less energy as heat than Bronze ones, which can mean lower running costs and less fan noise. For a light-use office PC, Bronze is often enough.
What is the difference between modular and non-modular power supplies?
Modular power supplies have detachable cables, while non-modular ones have all cables permanently attached. Fully modular units make cable routing easier and reduce clutter in small cases. Non-modular units work well when most of the cables will be connected anyway.
Can I use a server power supply in a desktop PC?
Usually not without adaptation. Server power supplies come in specific shapes, such as 2U, and often connect through proprietary backplanes rather than standard ATX cables. For a desktop build, choose an ATX, SFX or TFX unit that matches your case.
