First the power supply or ( PS ) as it is known, The PS comes in two types the old AT and newer ATX, We are building a new computer so all we care about is ATX, And they come in two types P4-Ready and AMD-Approved, You should only buy a P4-Ready for the simple reason that the AMD-Approved ones Will not work with P4 motherboards it is missing a plug, But a P4-Ready one will work with AMD or P4 motherboards , I say buy the P4 one that way you will be ready for what ever motherboard you pic AMD or Intel, Power Supples range in size from 145Watts to 550Watts I use 400Watts, How big or small your PS is depends on how much stuff you are going to run, Stuff like CD-Roms and DVDs if you are going to have one or two of them so get a big one and you will be ready for anything.
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