  In the last several years, tightly coupled PC clusters have become widely
applied, cost effective resources for lattice gauge computations. This paper
discusses the practice of building such clusters, in particular balanced design
requirements. I review and quantify the improvements over time of key
performance parameters and overall price to performance ratio. Applying these
trends and technology forecasts given by computer equipment manufacturers, I
predict the range of price to performance for lattice codes expected in the
next several years.
