TechARP presents the PC Power Management Guide, a perfect primer on figuring out what exactly is going with power in your PC, beyond how many amps to expect from your 12W rail.  If you are confused between ACPI and APM, or trying to figure out what a C4 State is and why your CPU went there, then read on, and all shall become clear.
“Computer performance have increased at an amazing rate in recent years, and unfortunately so does power consumption. An ultimate gaming system equipped with a quad-core processor, two NVIDIA GeForce 8800 Ultra, 4 sticks of DDR2 memory and a few hard drives can easily consume 500W without doing anything! To reduce power wastage, a few industry standards have been developed to make our computers work more efficiently.”

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