The ubiquitous CEE AC power cord
DC Power Output Connectors
The DC power connectors vary somewhat between AT, ATX, and proprietary form factors. While the disk drive connectors are all the same, the motherboard connectors are different and incompatible between major form factors, although sub- versions of ATX have the same connectors. Figure 4.6 shows different ATX DC power connectors.
Figure 4.6: ATX DC power connectors.
In addition to the power connector variants, different cases require power supplies of different shapes and sizes, or they won't fit in the case.
Determining Power Supply Power Requirements
Common power supplies come in a range of about 80 watts to 600 watts. How do you determine how much you need? First, determine the number of drives, the processor, number of expansion cards, and so forth. Know that it never hurts to have more capacity than you need. Check the motherboard and processor documentation. Some power supplies are overrated. For example, if you find a 300-watt power supply at a very low price, and you notice that it is physically light in weight, it is likely to fail under load.
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