12V line power requirements
Alright, it is 5 in the morning and I am tired of combing through the whole Internet. My guess is that I will wake up to a some flaming responses, but I hope those will be kept to a minimum.
So as I am figuring out what kind of approach to use in building my power supply, I figured (obviously) that the main problem becomes 12V line. I've search through ATX specifications of a 250W PSU (I am trying to build something of that order), and those specifications have two (2) 12V lines. The main one having 1-14 Amp requirements and the secondary having 1-8 Amp requirement. Leaving alone the fact that the numbers do not add up, I came to a thought that might or might not make the building easier.
I am thinking of finding the largest common current consumption device for the 12V line, and based on that create several separate 12V lines (for processor, devices, more devices) as opposed to one big one. What I lack is the understanding of how much current is being consumed on each rail of the newer relatively powerful computers.
From what I see based on my search, 7-8 Amps is the most needed for the top of the line Athlon XP's. I cannot find info for P4's or AMD64's that would break down the consumption by rails, most publications give the number provided by manufacturer plus their own estimate of the power drawn by the whole system. Deriving anything from PSU specs is just about impossible, since they give maximums that cut into the power of other rails. High powered (450W) power supplies have two rails that can continuously provide 10-12 amps... but then again, I have no idea how it is spread among the components.
So, my question is, what is the largest SINGLE 12V current consumption in a computer system? My understanding is that it will be the CPU, but the precise number eludes me. I appreciate your input. Going to sleep now.