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Verified compatibility answer

Does Dell XPS 13 9350 support Thunderbolt 4 and 40 Gbps USB4?

Yes. Dell documents Thunderbolt 4 with Power Delivery, USB4, DisplayPort 1.4 and data rates up to 40 Gbps on the XPS 13 9350 Type-C port. Actual device throughput can be lower because the cable, dock, peripheral and storage media all participate in the negotiated path.

CompatibleVerified 2026-08-11

Why this answer matters

A Type-C connector can fall back to slower USB modes. Knowing the laptop side supports Thunderbolt 4/USB4 prevents replacing the computer when a cable or dock is the real limit.

2 requirements3 verification steps1 primary source

Requirements

What has to be true

  • A Thunderbolt 4 or compatible USB4 cable/device for the intended mode.
  • No slower hub or adapter between the laptop and peripheral.

Verify it yourself

Use this test sequence

Change one variable at a time so you know which requirement made the difference.

  1. 1

    Connect the peripheral directly before testing through a dock.

  2. 2

    Confirm the cable's Thunderbolt/USB4 rating.

  3. 3

    Separate link capability from real storage transfer speed.

Limits

What this answer does not prove

  • 40 Gbps is the interface ceiling, not guaranteed file-copy 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.
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USB-C Display Path Readiness CheckCheck four documented prerequisites for sending video through USB-C, Thunderbolt, a dock, cable or adapter to a display.
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