I've got a customer that wants to upgrade his system REALLY CHEAP. He wants a new GPU, but to do that I think he'll have to upgrade his old (2006) power supply from 300w to something beefier. I have a 6870 that I could sell to him but it's probably going to be huge overkill for him. So lets do this, please find me the cheapest PSU that could handle my 6870 and the cheapest that could handle say, a 9800gt. I don't have enough confidence to get him a $20 500w PSU and say "yeah, this will work"