How to Identify an ATX Power Supply

ATX (Advanced Technology Extended) is the leading form factor for desktop computers, which specifies the general sizes for certain components, such as the motherboard, case, and power supply. Since most desktop computers use the ATX sized components, most computers are installed with ATX power supplies, which cube shaped devices that convert electricity into current the computer's components can use safely. To identify a power supply the case must be opened so that identifying labels can be observed.

Difficulty: Moderate

Instructions

Things You'll Need:

• Screwdriver(s)

1. Turn off the computer and unplug the power cable.

2. Use a screwdriver to take out the screws holding on the left side panel of the computer and remove the panel.

3. Locate the power supply. Most power supplies are situated in the top back corner of the case; you will know where it since it is the device you plug your power cord into on the back of the case.

4. Check to see if there are any visible labels which identify its manufacturer, wattage, amperage and other information. Usually the identifying label is on the side of the power supply facing outward, so it is easily viewable once the computer is open. Sometimes the label might be on the opposite side, or be hidden due to a cramp case. If you cannot see the information you need, continue to step five, otherwise skip to step seven.

5. Remove the power supply by unscrewing four mounting screws on the back on the back of the case and sliding it forward, out of its mounting bay. This will allow you to rotate the power supply freely in order to record all identifying information.

6. Remount the power supply in place, by sliding it back into its bay flush against the back of the case, then putting the screws back in.

7. Close the case.

Tips & Warnings

• * When you add additional devices to a computer, such as more hard drives, DvD drives, RAM, and more powerful video cards, they draw more power and may short out an old power supply. Consider upgrading your power supply if you are upgrading many other parts, especially your video card.
• * Do not open the power supply itself, even if it is unplugged, as it can store an electrical charge.

Resources

• Info on identifying a power supply