Windows XP, dfi X48, Seagate 320gb HD, E8400 with original fan, two 120mm fans one 80mm and a X1950 Pro. Also a Plextor 716 sa. The one thing I notice is my 12v rails only put out 18amps. Is this a problem ?
It puts out a lot more than 18A, more like 50-60A (the rails don't just add up). That is a kick ass power supply you have there, you will be perfectly fine.
About the 12v rails, I'm not good at understanding all this amps and voltages stuff, that's what's in the power supply box. Your numbers ( 50-60A ) seem a little high though.