I currently run Dual Athlons, love em.. but I have seen and felt on servers the advantage of Hyperthreading.. and it rocks all. I mean getting an almost 40% increase in power is slick
Also Xeons have one advantage hammers wont have. GOOD CHIPSETS. I mean you got Serverworks chipsets that have memory bandwidth that AMD would kill for. ANd Intels new i series chipsets for Xeons are rocking it big time. Oh and there are solid drivers and NONE fo the total BS issues you get from VIA or SIS crap.
thats why I like my Dual AMD. 1 Chipset = AMD. No VIA/AMD things just one solid and stable chipset.