2 ms·4 high-power and 4 low-power cores.by BooneJS 6y ago4 high-power and 4 low-power cores.jagger27 6y agoAt 9:15 of the keynote they claim that the "high-efficiency" cores are as powerful as the outgoing dual-core MacBook Air's cores. Seems pretty good to me.BooneJS 6y agoAgreed, but I wish I knew the numbers behind those statements.