Why this answer matters
This makes either documented Thunderbolt port a valid starting point for a compatible dock or display, while cable and dock capability still determine what actually negotiates.
1 requirements3 verification steps1 primary source
Requirements
What has to be true
- Thunderbolt/USB4-compatible cable and device for those modes.
Verify it yourself
Use this test sequence
Change one variable at a time so you know which requirement made the difference.
- 1
Test the dock/display directly on each Thunderbolt port.
- 2
Use a known full-featured cable.
- 3
Separate charging, USB data and DisplayPort results because they can fail independently.
Limits
What this answer does not prove
- 40 Gbps is an interface signaling rate, not guaranteed application throughput.
Relevant DeviceOK checks
Test the part you can observe
Data Transfer Time CalculatorEstimate ideal transfer time from data size and an entered link rate.
→USB-C Display Path Readiness CheckCheck four documented prerequisites for sending video through USB-C, Thunderbolt, a dock, cable or adapter to a display.
→Charger Wattage MatchCompare a device's entered power requirement with a charger's rated wattage while keeping USB-PD/PPS and voltage-profile limits explicit.
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