A system that I came across online that I bought on CL had a gtx 590 in it. The power supply that the system had was some weird 1000w off brand unit that I don't trust at all. So I'm just trying to figure out what wattage of PSU do I need to test this card out? I know it isn't the latest or that great of a budget card, but I got the system for only $40 and I wanna test out the card/system for fun.