Power supplies | D.M. Distributors

229 models

Choosing power supplies

Choose a power supply for the system's total load, the connectors the graphics card needs and the efficiency level. Leave headroom, because an undersized unit is a common cause of random shutdowns.

Wattage: Add the maximum power of the processor and graphics card to about 100 W for the rest of the system, then add 20 to 30% headroom. Follow the recommended PSU rating on the graphics card's datasheet.
Efficiency rating: 80 PLUS levels (Bronze, Silver, Gold, Platinum) set minimum efficiency at 20%, 50% and 100% load, and higher levels waste less power as heat. Check which input voltage the rating applies to, because some units are rated at 230 V only.
Graphics card connectors: The supply must have the connector the card needs: 8-pin PCIe, or the 16-pin 12V-2x6 connector (12VHPWR) on current RTX 50 series cards. Units marked PCIe 5.0 ready include the 16-pin cable, so no adapter is needed.
Modular or fixed cables: Modular units let you connect only the cables you use, which tidies the build and improves airflow. Fixed-cable units suit simple builds in roomy cabinets.
Input range and protection: Input ranges differ: 100 to 240 V on full-range units, and 155 to 240 V or 200 to 240 V on others. Use a UPS or stabiliser where mains voltage dips, and look for over-voltage, over-power, short-circuit, under-voltage, over-current and over-temperature protection.
Size: ATX supplies are 150 mm wide and 86 mm high. Check the depth against the cabinet, especially with a PSU shroud and modular cables, and check that the cabinet takes a standard ATX unit.

Installation and compatibility

Use only the cables supplied with the unit. Modular cable pinouts differ between makes and models, and a wrong cable can damage components.
Fit the supply with its fan facing a vent: down where the cabinet has a filtered bottom intake, up where it does not.
Some supplies with active PFC can shut down on UPS units with a stepped (simulated) sine wave output. Use a pure sine wave UPS with high-wattage units.

Enquire about power supplies

Send the models and quantities you need, or describe the requirement if the model is not listed. The sales desk will confirm price and availability.

Power supplies models