X-bit Labs compared the performance of dual-processor Intel Xeon and AMD Opteron based workstations:
In this review we are going to put up a fight between the basic CPU models for dual-processor workstations with the most popular x86 architecture, i.e. between AMD Opteron and Intel Xeon. The competition between these CPUs may become even tougher, now that AMD and Intel have both implemented dual-core designs in them. The situation is also spiced up by the fact that Intel seems to have lost the previous round where single-core models fought. The Xeon based on the NetBurst architecture proved to be slower than the Opteron in terms of sheer performance in a majority of applications as well as economy, i.e. power consumption and heat dissipation.