If we were to compare the R10 results for AMD 965 and Intels i5 750 one will notice that the scaling is better in 965 than in i5 750.

PhII 965 does 3941 for single and 14012 for multi
i5 750 does 4238 for single and 14142 for multi
i7 920 does 3846 for single and 16211 for multi

In i7's case HT helps out a lot..