Help me choose: More efficient power supply

Power supply units (PSU) are devices that power a computer. They convert AC power from utilities into DC power used in most electronics.

Dell OptiPlex offers standard power supplies as an entry offering, as well as more efficient options that draw less power and dissipate less heat from your desktop. More efficient power supply options can improve efficiency, which translates into annual energy cost savings for your desktop systems. Higher-efficiency power supplies, combined with efficient CPUs, draw less energy and dissipate less heat from your desktop when operating day to day, helping save you money with reduced power consumption and lower cooling costs.

Achieve potentially significant annual energy savings, see the Dell Energy Calculator ( for specific model calculations

Air conditioning costs will likely be lower as a result of the reduced heat load

Dell’s higher-efficiency PSUs meets the following specifications:

80 percent or greater efficiency at 20 percent, 50 percent and 100 percent of rated load, and True power factor of 0.9 or greater

Higher power factor reduces current draw by roughly 50 percent, which means that more computers can be placed on the same branch circuit without the need for costly electric infrastructure upgrades. In new construction situations, smaller and less expensive distribution systems can be constructed when computers using higher efficiency power supplies are considered in the planning process.

Finally, more efficient power supply options on Dell OptiPlex provide wide-ranging features:

Wide-ranging PSUs can operate at any input voltage between 90 VAC to 264 VAC