Hello everyone. I have a 320 watt psu made by gigabyte with a intel intergrated gpu and im thinking of putting one of the Nvidia GT 630/GT 640/GT 440 graphics cards in my box. However im worried about the power I have and I simply do not have the money to purchase another psu. I plan to play games like empire/napoleon total war and arma 2 as well as fsx. Will the psu be enough and willl the above cards be able to play the desired games decently (not on max e.t.c). I need to know as im on a tight budget and can you recomend any better but similar cards that will work on the mentioned PSU? Thanks.