https://wccftech.com/amd-vega-20-radeon-instinct-pcie-4-support/

Talks about AMD using the latest PCIe standard for their next-generation Vega 20 GPUs don’t seem so far-fetched. The latest details from Videocardz show that the upcoming Vega 20 parts for servers and HPC (Deep Learning / Datacenter) market are going to adopt new standards.

According to latest Linux drivers, it looks like graphics engineers at the Radeon Technology Group are working to support PCIe 4.0 speeds for upcoming graphics cards. The new interconnect will be doubling the bandwidth over PCIe 3.0, offering a 16 GT/s bit rate from 8 GT/s, and total bandwidth of 64 GB/s (x16 interface) compared to 32 GB/s (x16 interface) on PCIe 3.0.