EDIT: After reaching out to Sonnet Tech, they recommend that this is only a representation issue and that the box is indeed correctly connected at 40 Gb/s.
macOS 10.15.3 - MacBook Pro 16-inch 2019
5 Gb/s but why not 40 Gb/s?
Thunderbolt 3 specs out 40 Gb/s over a USB-C connection, yet under Activity Monitor we only see 5 Gb/s.
System Information
PCIe x16 lanes show up in System Information with the eGPU, which is correct - but through Thunderbolt 3 only x4 lanes are accessible per specification so it’s difficult to know what the true bandwidth is between the computer and the eGPU enclosure.