xeon cpus are used for servers sheerly because of there double cpu capablity and huge cache size. Thus providing say a 3.2 xeon when acompanied by an other xeon in the same machine to almost double cache to almost double everything. Providing a more powerful cpu and systme. Right now there are mobos in whitch you can have 2 p2 on it and make it run i think to 1ghz seeing this mobo only supports 350mhz cpus so its really a plus.