When you talk about entry-level and midrange servers these days, you're often talking about multiprocessor Pentium machines running Microsoft Windows NT or Windows 2000. But there are cases in which single-processor Pentium III servers might be best.
Scalability is key to server performance and is a big part of the appeal of multiprocessor systems.
But you also can significantly boost the performance of unichip servers without adding an extra processor or two. I loved what I saw. But most of the servers listed meet these criteria. In fairness to the companies listed in this guide, every manufacturer sets different standards for what it considers to be the base models of its various server families. This makes a direct comparison of price and features difficult.