He could just plug in the card and hope. But a friend’s voice echoed in his head: “Never guess with power. Guess = fireworks.”
There it was:
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.” 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. He could just plug in the card and hope