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It's an 850W PSU that retailed for 140 on sale.

It cannot be underpowered. The only possibility would be it somehow became underpowered in a way that I don't really understand.

I was really hoping it was something I could just upgrade.

If I have to buy a new power supply, it's like buying a useless part IMO.

The problem is, the only other video card I have is AGP, and my mobo doesn't support it. Basically nothing out of my other PC will suffice. I believe I used the power supply from it previously once but didn't have enough wattage to handle the graphic card.