Guys.. jason95821 just bought a PC from EBay and wants to find out what his Power Supply is rated at. That way he can find out which video card he can get since they have varying power demands. Whey you buy a video card, it will tell you "XXX watt power supply required" and he doesn't want to get a card that is not compatible with his new computer.
That's why I suggested he open the case by removing the access panel and looking at the power supply to find its rated wattage. And that's why I also suggested he get a low power graphics card and if he's lucky, the computer comes with a 300 watt power supply and he could get something like this -
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My suggestion is get the best card you can and set aside some funds to get a better power supply like a 650 watt.