How to Check Power Supply Wattage on PC

When upgrading your GPU, you may also need to upgrade your power supply unit (PSU) to one with higher wattage. However, you can't check the PSU wattage through software or BIOS, as the PSU doesn't have a data connection to the PC. So, how can you check your power supply on a PC? After reading this guide, you'll know the most effective methods to solve this problem.

3 Simple Ways to Check Power Supply Wattage on PC

1. Find the Purchase History
The easiest way to check your power supply specifications is by reviewing your purchase history (no need to open the case). Whether you bought just the PSU or a pre-built PC, the order details should include the PSU specifications.

2. Physically Check the Power Supply
If you can't find the purchase history, you can physically check your power supply by opening the PC case. This is the most accurate method and only requires removing the side panel of the PC case.

Step-by-Step Guide:

1. Safety First! Turn off your PC and unplug the power cable.
2. Remove the side panel of the PC case and locate the power supply, usually at the bottom.
3. Look for the "wattage" label on the power supply. If it's unclear, take a picture with your phone or use a mirror to read the label.

3. Use a Kill-A-Watt Meter to Measure Actual Power Draw
A Kill-A-Watt meter measures the real-time total power consumption of your entire system. By recording the readings during a stress test, you can determine the peak power consumption.

Step-by-Step Guide:

1. Get a Kill-A-Watt meter.
2. Plug the meter between the wall socket and your computer's power cable.
3. Download free stress testing tools for both the CPU and GPU from their official websites. We recommend AIDA64 for the CPU and FurMark for the GPU.
4. Run AIDA64 and FurMark simultaneously for at least 10-15 minutes and record the peak data.

Key Mistake to Avoid:

Some blogs suggest using HWMonitor to check the GPU's wattage, but we advise against this. Based on our testing, HWMonitor typically doesn't provide accurate wattage (power consumption) for the CPU or GPU. It also fails to capture all the current usage. Even if you try to estimate based on the displayed data, the results are usually inaccurate and not reliable. Therefore, we strongly recommend avoiding this method.

Conclusion

Checking your power supply on a PC isn't difficult. For most users, the easiest and most reliable method is to check the purchase history or open the case to inspect the label. Using a Kill-A-Watt meter for direct measurement also provides accurate data on power consumption. Avoid relying on software like HWMonitor to estimate wattage. 

After checking the wattage, you may need to upgrade to a new PSU. It is crucial to choose a reliable PSU brand. ESGAMING offers PSUs with 80 Plus certification, ranging from 400W to 1200W, allowing you to select the one that best fits your needs.   

FAQ about power supply

How to check your power supply wattage on a PC without opening it?
You can't directly check your PSU wattage with software, but you can refer to your purchase record or use a Kill-A-Watt meter to measure actual power draw during a stress test.

What's the lifespan of a PSU?
A good power supply can last anywhere from 5 to 10 years, depending on usage, heat, and the PSU's quality.

About ESGAMING

Founded in 2017, ESGAMING has quickly become a recognized emerging brand in high-performance computer components and accessories. From PC cases and power supplies to cooling systems, ESGAMING is dedicated to delivering creative, reliable, and well-crafted E-sport solutions for gamers, creators, and PC builders around the world.

For more information, visit www.esgamingpc.com