Power Supplies: Upgrade your power supply, replace a dead Power Supply, or upgrade to a new PSU from our huge selection of standard ATX and Micro ATX power supplies. An ATX power supply is the most common PSU and is used is most desktop PCs, whether you have a custom build, Dell, Compaq, HP, or other PC. A mATX power supply is the standard size for smaller form factor builds and cases. Make sure to always check the dimensions, output wattage, and connectors to ensure you're getting the right supply. We also carry DC Laptop jacks.