To Check Psu Wattage — How

Leo shut down his PC, unplugged the power cord, and pressed the power button for 10 seconds to drain leftover charge. He laid the tower on its side, removed the side panel (two thumbscrews), and aimed a flashlight inside.

Leo stared at the new graphics card box on his desk. “Requires 650W PSU,” it read in bold letters. His PC ran fine, but it was a prebuilt from two years ago. He had no idea what power supply was inside. how to check psu wattage

Here’s a short, practical story about figuring out a PC’s power supply wattage without taking it apart — unless you really have to. Leo shut down his PC, unplugged the power

He opened Windows Search, typed “System Information,” and found nothing about power supply. He tried HWMonitor — no PSU data. Then CPU-Z, then Speccy. Nothing. Software can’t read PSU stickers because there’s no data cable from the power supply to the motherboard. Lesson one learned. “Requires 650W PSU,” it read in bold letters

So he gently unplugged the main motherboard 24-pin cable and the CPU 8-pin cable (noting where they went), unscrewed the four PSU mounting screws, and tilted the unit just enough to see the main label.

He couldn’t read it without unscrewing the PSU and turning it around. But before doing that…

Leo remembered a trick: search the PSU model number online. Some prebuilt PCs (Dell, HP, Lenovo) have proprietary PSUs with the wattage listed in their service manual. He searched his PC model + “power supply specs” and found a forum thread: “Comes with 500W, upgrade to 650W requires adapter.”