https://www.theregister.co.uk/2018/12/06/qualcomm_snapdragon_8cx/

The mobile world is fast on the heels of the laptop world. Qualcomm, the designer of Snapdragon processors primarily for smartphones and tablets, today teased the 8CX: a fanless 64-bit Arm-compatible 7nm system-on-chip for notebooks.

The Snapdragon 8CX follows on from the 10nm SD845 and SD850, which were both aimed at Windows 10 laptops, so-called "always connected mobile PCs" because they feature cellular network connectivity and Wi-Fi to always be tethered to the internet. As for the name, we guess the C is for compute and the X is for extreme.