h t t p :/ / w w w . anandtech.com/cpuchipsets/showdoc.aspx?i=3092 (Below 5 posts )
Interesting; In short : Anandtech has put together a Phenom preview, where it compares a single Barcelona to a pair of dual-core Opterons at the same clock speed. From the results, it seems the new Barcelona core is somewhere between 10-15 percent faster, clock to clock, than the current Athlon 64 X2s.
Looks good for intel!