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Intel have a higher cache, AMD pose 256-512KB but Intel have 1MB Level 2 cache. Intel clock speeds tend to be higher, I haven't seen an AMD clocked at 3.06GHz. And as well as that Intel have better overclocking facilities, I have seen a 3.06GHz Pentium Xeon overclocked to 3.71GHz, that's 650MHz!
AMD and Intel have different caching systems... what is present in L1 cache in a P4 is also present in L2, whereas in AMD systems they use a system that doesn't allow duplication between caches.