I have a 650 watt psu. Which is not certified, or from a third party. I am currently running a GTS 250 on it without any problems. That consumes 150 watts. The GTX 285 which i am thinking of upgrading to consumes 205 watts. Do you rekon i would be safe with my current power supply. it has enough connectors to plug to the graphics card. If i have to upgrade the psu my budget would be £40.