The power supply may be the last thing on your mind as your evaluate a computer, but it will really make a difference if you don't get a good one! A high-performance CPU, like the one in the Northrop Computer Ultimate PC, requires a good size, high-quality power supply. A cheap or underpowered power supply will often cause instability.Our 400 watt power supply is certfied and recommend by AMD® for use with their high-end Athlon™ XP processors. Its 2 built-in fans help the power supply become part of the overall cooling system for our case.