As I recall from that generation, also the first models of AMD opterons, commonly built into dual socket motherboards. For the time they were very speed competitive with the Intel option.
I recall the dual socket (everything was single core at the time) Xeon being particularly unimpressive.
In fact it was somewhat of a step backwards from the better thermals/power efficiency of a dual socket, 1.13 to 1.4 GHz / 512KB cache Tualatin pentium 3.
