Intel Core2 and Nehalem, are Stronger then the K8/9/10 and 10.5 architectures regardless and irrespective of the number of cores on the cpu. This is brought about by not only the addition of Enhanced cpu instruction sets such as SSSE3, and SSE4, but also via the optimisation of the On Die caches,
Infact,if you want a decent example.
then all you have to do is look at the advanced folding at home projects.
Intel CPU's pull twice, if not 3x as higher scores then AMD CPU's clocked at similar speeds.