AMD recommends a minimum power wattage capacity for its processors.
Different processors may have different recommended wattages. This is to
[help] guarantee that you use a power supply that can feed 2 hard drives, 2
floppies, several sticks of memory, video card, sound card, and other
hardware, plus still have enough current to juice up the power demands of
the CPU. Flaky behavior can result if your power supply cannot supply
enough juice.
The P4-ready spec means that there is output from the power supply. It is
another tap to provide 12V and looks like a 4-pin square Molex connector and
allows more current to get to the motherboard for the 12V (each wire has a
max amperage rating, and the one wire used before isn't sufficient for these
later higher wattage processors). ATX style motherboards that are P4 ready
are also noted as ATX12V. See
http://www.directron.com/directron/p...l.html#p4power.
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