The 7840HS is also designed for thin-and-light laptops, according to AMD, and it has 8 cores. It is a "35W" chip, but AMD says it is for ultrathins ("The Ultimate Ultrathin Processor"), and TDP is a relatively meaningless number these days.
That wccftech article is the only one I can find that lists a 7640U (not HS) processor. I think they combined some previous rumors with the actual announced specs by accident. I can't find any indication that the 7640U actually exists.
That wccftech article is the only one I can find that lists a 7640U (not HS) processor. I think they combined some previous rumors with the actual announced specs by accident. I can't find any indication that the 7640U actually exists.