How To Check Computer Power Supply Wattage [updated]

Knowing the wattage of your Power Supply Unit (PSU) is essential when upgrading components like a graphics card or troubleshooting random shutdowns. Since software cannot measure the physical label on the box, you usually have to check the hardware itself.

The most foolproof method is to look at the on the power supply itself. Open the Side Panel: Remove the side of your PC case. how to check computer power supply wattage

If you cannot open your case, you can calculate your to get a ballpark idea of what PSU you likely have or need. Knowing the wattage of your Power Supply Unit

Here are the three most common methods, ranked from easiest to most difficult. Open the Side Panel: Remove the side of your PC case

: Look for a large bold number followed by a "W" (e.g., 650W , 750W , or 1000W ). Reading the Total Power vs. Rails