I currently have a ZT Affinity 7622Mi with a ATX 12V 350W power supply. I was hoping to upgrade to a EVGA GeForce 8400 graphics card. Would I need to upgrade my power supply or would the computer be able to handle it?
It doesn't get newer generation than Radeon 7000 (although waiting to see if the price drops change anything is a good idea) and the power supply that I recommended is far more than the bare minimum. Were you referring to OP's question about the Geforce 8400 card with the 350W PSU when you said this?
Radeon 7850 is supposed to drop to $200 MSRP with the 7870 dropping to $240 MSRP, but you'll find them both well under their MSRPs. Heck, you could find several 7870 models below $240 even before these price cuts. Unlike Nvidia's cards, MSRP is kinda ignored for AMD's cards, although I'm not sure of why that is.