Article Number: 000060905
Customers using Dell systems with a Thunderbolt 3 port may report they are unable to achieve data transfer rates up to the maximum 40gbps. Some customers may report that the data transfer speeds vary depending on the system they are testing on.
Customers may also report that the system only has 2 lanes of data and not the expected 4 lanes. See the chart below on which systems were designed with 2 lanes and which were designed with 4 lanes.
|Platform||Lanes of PCIe capable using Thunderbolt 3 port|
|Dell Precision 3510 *||4 lanes|
|Dell Precision 3520 *||4 lanes|
|Dell Precision 5510||2 lanes|
|Dell Precision 5520||2 lanes|
|Dell Precision 7510||4 lanes|
|Dell Precision 7520||4 lanes|
|Dell Precision 7710||4 lanes|
|Dell Precision 7720||4 lanes|
|XPS 12 2-n-1||2 lanes|
|XPS 13 9365 2-n-1||4 lanes|
|XPS 13 9350||2 lanes|
|XPS 13 9360||2 lanes|
|XPS 13 9370||4 lanes|
|XPS 15 9550||2 lanes|
|XPS 15 9560||2 lanes|
|Latitude 7275||4 lanes|
|Latitude 7285||4 lanes|
|Latitude 5570 *||4 lanes|
|Latitude 7370||4 lanes|
|Latitude 7280||4 lanes|
|Latitude 7480||4 lanes|
|Latitude 5480||4 lanes|
|Latitude 5580||4 lanes|
|Alienware 13 R2||2 lanes|
|Alienware 15 R2||4 lanes|
|Alienware 17 R3||4 lanes|
|Alienware 13 R3||4 lanes|
|Alienware 15 R3||4 lanes|
|Alienware 17 R4||4 lanes|
|Inspiron 7577||4 lanes|
* Only select configurations have Thunderbolt 3 ports.
No cause information is available.
Thunderbolt 3 ports can be configured with 2 or 4 PCIe lane designs. Alpine Ridge uses separate inputs for Display Port 1.2 data (DP stream is not part of PCIe traffic).
Thunderbolt 3 bandwidth is shared bandwidth which means all connected devices use the bandwidth for all protocols that transfer through the same Thunderbolt 3 cable (DisplayPort over USB-C traffic and PCIe traffic such as USB, Ethernet, and Audio). Below is a chart that can help explain how different items can use the 40gbps total bandwidth. The Dell Thunderbolt TB16 dock can use up to the full 40 Gbps of bandwidth depending on what devices are attached to the TBT dock.
|HDMI||1.4||10.2 Gbps||Up to 4K2K @ 30 Hz true color|
|Mini Display Port||1.2||Up to 16 Gbps per lane||Up to 4K2K @ 60 Hz|
|Full-Size Display Port||1.2||Up to 16 Gbps per lane||Up to 4K2K @ 60 Hz|
|RJ45||IEEE 802.3||10/100/1000 Mb/s|
|USB (2)||2.0 Type A||480 Mbps||5 V @ 500 mA, 2A Peak|
|USB (2)||3.0 Type A||5 Gbps||5 V @ 900 mA, 2A Peak|
|USB w/Powershare (1)||3.0 Type A||5 Gbps||5 V @ 2A Power Share|
|USB Type-C Thunderbolt™||Gen 3||Up to 40 Gbps||Up to 60 W*|
For more information go to: Thunderbolt 3 Tech Brief
31 Oct 2023