Ive been browsing/searching around the forums and misc other places and can't seem to find a definitive answer to a question of mine concerning the amperage needed on whichever power supply I chose. For example I am building a new system and am probably going to buy an AMD 64 x2 6000+ and throw in either a X1950XT or 8800GTS depending on the money I have to spend along with the various other parts I need to buy. Some of my following questions are: 1. How much total wattage should be sufficient to run without worrying if Im starving the components for power. 2. How much amperage do I Need Per Rail (Is it 12v Rails); or is it across multiple rails that matter?.. ie say someone suggested that I need atleast 25amps on 12v rail, and my power supply comes with 2 rails both rated @18amp per rail giving me @36 across both.. would that mean it's sufficient? Or does it mean I need atleast 25 Per Rail. Peoples comments on various sites ie. newegg confuse me on this matter; thanks for helping.