K10 is faster than Intel Quad even in integer performance
Tom Yager points out that if you use GCC compiler, then AMD's Barcelona is 9% faster than Intel in integer performance. Those high integer performance numbers Intel achieved was attained with Intel compilers. Notably, Intel is not a well known compiler vendor. Most developers use GCC or Microsoft compiler to ensure language compliance. It is doubtable that Intel compiler correctly implements those complex C++ grammar and semantics.