https://www.techradar.com/news/intel-kills-off-kaby-lake-x-processors-and-boosts-windows-10-april-2018-update-graphics-for-laptops

Intel has revealed it's discontinuing its quad-core Kaby Lake-X processors, a mere 11 months after they were first announced, with the company explaining its plans for the chips’ EOL (end of life) status.

The Intel Kaby Lake-X Core i7-7740X and Core i5-7640X were designed for the enthusiast market, with the chips capable of some incredibly impressive overclocking performance, but it appears that the response to them was muted, with poor sales being cited as the reason for the discontinuation.