I remember that Apple used to wave around these SIMD benchmarks showing their PowerPC chips trouncing Intel chips. In the fine print, you'd see that the benchmark was built to use AltiVec on PowerPC, but without MMX or SSE on Intel.
Ah so the way Intel advertises their chips. Got it.
I don't have a horse in this race, Jobs lied or bent the truth all the time so it wouldn't surprise me, I'm just curious.