https://www.theregister.co.uk/2019/07/08/amd_shipping_7nm_desktop_cpus/

Ever-ambitious chip maker AMD has started shipping the third generation of its Ryzen CPUs, built on the 7nm process.

These are the first desktop processors to support PCIe 4.0 standard, which potentially doubles throughput to 16 gigatransfers per second when compared to PCIe 3.0 – something that's increasingly important for things like GPUs, dedicated machine-learning accelerators, and non-volatile memory.