I've decided to upgrade my video card from a GeForce 7900gs to a GeForce 8400gs, and well, I'm not too sure my factory power supply can hack it. I'm currently using an Emachines w3615 with 2gb of ram and windows vista 32but home premium. I've the turned internet upside down looking for the specs to see if my can run with that or not but to no avail. If I cant run it as is, which I'm sure I can't, any recommendations on a upgrade would be most welcome.