On July 27, 2018 Intel announced that their next generation 10-nanometer chip has production delays and will not available for sale till second half of 2019. This means that most PCs and Apple MacBooks will not be upgraded to the next models for more than a year since thy all will be waiting for new Intel 10-nanometer chip.
At the same time this Intel delay is good for Advanced Micro Devices which are currently attacking Intel server market with similar chips and has some new products coming out early in 2019 to compete with the latest Intel chips.
AMD investors were so happy with Intel troubles that AMD stock jumped as high s +8% till settling to +3% by the end of the day. Obviously lack of new chip products from Intel made a lot investors very unexcited about the future of the company and they sold the stock with an 8% loss today.