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.”
He decided to look for a label he could see. Some PSUs have a second sticker on the back (where the power cord plugs in). He checked there — nothing but voltage input specs. how to check psu wattage
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. Leo remembered a trick: search the PSU model number online