"The motherboard is dominated by the CPU's power supply unit. Flaws and mistakes are not allowed, so therefore ABIT goes a step further when quality and design of the switching module are considered. For the first time the power supply is realized in a form of quadruple voltage filtration (4-phase). I'll remind you that ABIT introduced the 3-phase power supply and with it gained a lot of sympathy from the end users. That was certainly not a marketing move, because I can personally testify that with it ABIT considerably raised the quality and the level of reliability and stability of its products. Every “phase” is made out of two N-type MOS FET transistors. “Philips” and “Fairchild” MOS FET transistors of the third and the newest generation are used. These are especially designed and optimized for effective operation of DC/DC converters, whose efficiency is of key importance for stable processor operation on high clock frequencies. This kind of transistors is used in a so called dual configuration (In/Out), when they give the best results in a sense of conductivity and loss during switching. This is a very important characteristic because of their use in motherboard power modules where speed of switching is of key importance for correct operation of fast processors."
FULL STORY @ BENCH-HOUSE (http://www.bench-house.com/motherboard/abit/bd7/abit_bd7r_001.html)