Power supply standard created by Intel and released in conjunction with their microATX motherboard form factor in 1997. It was revised in 2001 to comply with Intel's Pentium 4 revision to the standard ATX power connector. It is currently standardized for the following wattages: 90, 120, 150, 160, and 180.
I personally would not recommend using it in anything larger than a very basic system with everything integrated, especially an AMD Athlon system, given their power ratings.