Dell XPS 15 9530 Intel Core i7 13700H USB 4 Not Working Fix Windows 11

The USB 4 ports on your Dell XPS 15 9530 Intel Core i7 13700H are not working at full speed, USB 4 devices are not recognized, or Thunderbolt peripherals fail to connect. Intel Thunderbolt and USB 4 driver updates restore full USB 4 functionality on the Dell XPS 15 9530.

This guide covers Intel USB 4 driver updates, Thunderbolt authorization, and USB 4 cable verification for the Dell XPS 15 9530 Intel Core i7 13700H in Windows 11.

“XPS 15 9530 USB 4 port showed connected but NVMe enclosure only ran at USB 3 speeds. Cable was the issue – replaced USB 3.2 Gen 2 cable with USB4 40Gbps certified cable. Sequential read jumped from 900MB/s to 3200MB/s with the correct cable.” – Fadhli, video production professional from Bangsar South

Why USB 4 Does Not Work on Dell XPS 15 9530

USB 4 on the Dell XPS 15 9530 operates through the Intel Thunderbolt 4 controller, which supports USB4 Gen 3×2 (40Gbps), Thunderbolt 4, DisplayPort 1.4 Alt Mode, and PCIe 3.0 tunneling over the same USB-C connector. The physical USB-C connector is compatible with all USB-C cables, but bandwidth is limited by the cable rating – a USB 3.2 Gen 2 cable (10Gbps) connects physically but negotiates at 10Gbps rather than USB4 40Gbps, appearing as reduced throughput rather than connection failure. Device authorization for Thunderbolt PCIe tunneling requires explicit user approval in Windows for first-time connected Thunderbolt devices.

• USB-C cable rated for USB 3.2 (10-20Gbps) instead of USB4 40Gbps
• Thunderbolt device not authorized in Windows – PCIe tunnel blocked pending approval
• Intel Thunderbolt/USB4 driver outdated after Windows Update
• USB4 device in USB3 fallback mode due to cable or hub limitation

Fix 1 – Update Intel Thunderbolt and USB 4 Driver

Open Dell SupportAssist and install Intel Thunderbolt Controller Driver, Intel USB 4.0 xHCI Controller Driver, and Intel Thunderbolt Technology Driver updates. Restart. After restart, connect the USB 4 device and check Device Manager – Universal Serial Bus controllers for Intel Thunderbolt USB Controller or USB4 Host Router entries without errors. Updated Intel USB 4 driver for the XPS 15 9530 Intel Core i7 13700H includes improved USB4 Gen 3×2 tunnel negotiation and DisplayPort 1.4 allocation over Thunderbolt 4 fabric. The driver update resolves cases where USB4 devices connected but negotiated at USB 3 speeds due to incomplete USB4 handshake in the older driver version.

Fix 2 – Use USB4 40Gbps Certified Cable

USB 4 maximum speed requires a USB4 Gen 3×2 (40Gbps) rated cable. These cables are labeled USB4 40Gbps or Thunderbolt 4 on their packaging. USB 3.2 Gen 2 (10Gbps) and USB 3.2 Gen 2×2 (20Gbps) cables are physically identical to USB4 cables at the connector level but support lower bandwidth – they connect to USB4 ports without error but limit transfer speed to their respective ratings. A Thunderbolt 4 cable (any TB4 certified cable from Apple, Belkin, CalDigit, or Anker) is the highest-reliability choice for USB4 40Gbps on the Dell XPS 15 9530, as Thunderbolt certification verifies the 40Gbps bidirectional bandwidth the full USB4 specification requires for NVMe storage and dual 4K display output.

Authorize Thunderbolt Device

When a Thunderbolt or USB4 PCIe device is connected for the first time, Windows shows a notification asking to authorize the device. Click the notification and select Always Connect to permanently authorize the device for PCIe tunnel access. If the notification was missed, open Windows Control Panel – Hardware and Sound – Thunderbolt and find the unrecognized device entry – click it and select Always Connect. Without authorization, the Thunderbolt device operates in limited USB 3.2 mode (data and display only, no PCIe tunnel) rather than full Thunderbolt PCIe mode on the Dell XPS 15 9530. Authorization is stored per-device by serial number, so each unique Thunderbolt device requires a one-time authorization on the XPS 15 9530.

Fix 3 – Check BIOS Thunderbolt Settings

Restart XPS 15 9530 and press F2 to enter BIOS Setup. Navigate to Connection – Thunderbolt Adapter Configuration. Ensure Thunderbolt is enabled and set to No Security or User Authorization (not Secure Connect which blocks third-party Thunderbolt devices). Also check that USB4 mode is enabled rather than restricted to Thunderbolt-only mode. Save and exit. Dell BIOS Thunderbolt settings determine which devices can use PCIe tunneling over the Thunderbolt 4 ports – restrictive settings in enterprise Dell images can limit USB4 devices to USB 3.2 speeds by blocking PCIe tunnel negotiation that the full USB4 Gen 3×2 protocol requires for 40Gbps operation on the Dell XPS 15 9530.

Fix 4 – Verify USB4 Device Capability

Open Device Manager – Universal Serial Bus controllers and identify the connected USB4 device. Right-click the device – Properties – Details – Device description shows the USB version the device is operating at. A USB4 Gen 3×2 device shows USB 4.0 40Gbps or similar. If showing USB 3.2 despite correct cable and drivers, the device itself may not support USB4 – many external SSDs and hubs advertise USB-C but support only USB 3.2 Gen 2 (10Gbps). Check the device’s original packaging for USB4 40Gbps or Thunderbolt 4 certification to confirm the device is capable of full USB4 speed on the Dell XPS 15 9530 Thunderbolt 4 port.

Frequently Asked Questions

How do I fix USB 4 not working on Dell XPS 15 9530 Intel Core i7 13700H?

Update Intel Thunderbolt and USB4 driver via Dell SupportAssist. Use USB4 40Gbps or Thunderbolt 4 certified cable. Authorize Thunderbolt device in Windows notification. Check BIOS Thunderbolt security setting.

Why is USB 4 speed slow on Dell XPS 15 9530 Intel Core i7 13700H?

USB 3.2 cable connected instead of USB4 40Gbps cable (most common). Cable is physically identical but negotiates at 10-20Gbps instead of 40Gbps. Replace with USB4 Gen 3×2 or Thunderbolt 4 certified cable.

Does Dell XPS 15 9530 Intel Core i7 13700H support Thunderbolt 4?

Yes – two Thunderbolt 4 ports (40Gbps, USB4, DP 1.4, PCIe tunneling, USB PD 130W charging). Backward compatible with USB-C, USB4, and USB 3.2 devices.

Can Dell XPS 15 9530 Intel Core i7 13700H charge via USB 4?

Yes – USB Power Delivery up to 130W via both Thunderbolt 4 ports. Use 90-130W USB-C charger for full charging under load. Lower wattage charges slowly or maintains current battery level.

Conclusion

Dell XPS 15 9530 Intel Core i7 13700H USB 4 not working in Windows 11 is resolved by updating Intel Thunderbolt and USB4 Controller drivers via Dell SupportAssist for improved USB4 Gen 3×2 tunnel negotiation. USB4 40Gbps or Thunderbolt 4 certified cable is required for full 40Gbps throughput – USB 3.2 cables connect physically but limit speed to 10-20Gbps. Thunderbolt device authorization in Windows notification enables PCIe tunnel for full USB4 device functionality. BIOS Thunderbolt security User Authorization setting allows third-party USB4 devices to negotiate full PCIe tunnel access on the Dell XPS 15 9530 platform.