Something else I just found.

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The ATX power supply is different in a number of important ways. ATX power supplies and motherboards function at 3.3 volts or lower, instead of 5 volts, reducing motherboard cost, energy consumption, and heat production. >The fan on the power supply is reversed so that it blows air into rather than out of the case, <which helps keep the case clean and reduces heat buildup. This is necessary due to the high heat produced by the new generation of Intel Pentium II/III and AMD processors. The ATX power supply is turned on and off using electronic signaling instead of a physical toggle switch. This allows the computer to be turned on and off using software control, thus improving power management and energy-saving features. Because of this, ATX power supplies must be matched with ATX motherboards.


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It blows into rather than out of the case???
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