Thunderbolt 3 to Dual DisplayPort Adapter - 4K 60 Hz - Windows Only Compatible

Questions & Answers

Everything is hooked up but nothing is working. What should I do?
When you troubleshoot issues with a video adapter, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue: Video cables Video adapter Video source (such as a DVD player or computer) Video destination (such as a monitor or projector) To test your setup components, try the following: Use the cable, video adapter, video source, and video destination in another setup to see if the problem is with the components or the setup. Use a different cable, video adapter, video source, and video destination in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup. When you test your cables, it is recommended that you do the following: Test each cable individually. Use short cables when you are testing. When you test the video source and video destination, it is recommended that you do the following: Remove the video adapter from your setup and test to make sure that the video source and video destination work together without the video adapter. Test to make sure that the video source and video destination work together at the resolution that you want to use. Note: In order for your setup to work properly, the video source, adapter, and destination all need to support the resolution that you are using.

The monitor is not getting a signal and there is no error on the monitor. What do I do?
Try the following: Check that the monitor’s video port works with another source. Check that the cables between the source and the destination work with other equipment. Check whether the video adapter works with another source and another destination. NOTE: Thunderbolt 3 to DisplayPort video adapters will require active adapters to convert from DisplayPort to DVI or HDMI.

What to do When the Monitor is Not Getting a Signal and the Monitor Says “Out of Range"
The error “Out of Range” normally means that the resolution being output by the computer is not compatible with the display. Try lowering the resolution to see if that helps resolve the issue. You may need to connect another monitor or restart the computer or source to accomplish this.

My computer is not properly detecting my Thunderbolt 3 device. What do I do?
If your computer is not detecting your Thunderbolt™ 3 device, try the following: Update the Thunderbolt software on your Thunderbolt 3 host device. Update the Thunderbolt controller NVM firmware on your Thunderbolt 3 host device. Update the Thunderbolt controller drivers. Update your motherboard BIOS or UEFI. For more information about how to update the software, firmware, drivers, and BIOS or UEFI, refer to the website of the manufacturer of the Thunderbolt 3 host device. The following website includes links to some of the manufacturers of Thunderbolt 3 host devices: https://thunderbolttechnology.net/updates . If the manufacturer of your host device is not listed, you should contact the manufacturer or refer to their website for more information. For more information about how to check which version of the Thunderbolt software and firmware you are currently using, see the following FAQ: https://www.startech.com/faq/thunderbolt-3-check-software-firmware . For more information about Thunderbolt 3 host system and motherboard compatibility, refer to the Thunderbolt 3 Compatibility and Troubleshooting guide .

What do I do if I can only get a single display to work with my Thunderbolt 3 device?
If you are only getting a single display to work with your Thunderbolt™3 device, make sure that your Thunderbolt 3 host device can support two separate DisplayPort lines over Thunderbolt 3. While Thunderbolt 3 supports dual monitors over a single connection, not all Thunderbolt 3 host devices are designed to meet this requirement . If your Thunderbolt 3 host device does not meet this requirement, you cannot troubleshoot this issue with software, firmware, or driver updates, and you cannot use this device to achieve dual displays over Thunderbolt 3. If you are not sure whether your Thunderbolt 3 host device supports dual monitors, contact your Thunderbolt 3 host device manufacturer. If you confirmed that your Thunderbolt 3 host device does support dual monitors and you are only seeing a single display, see the following FAQ: https://www.startech.com/faq/thunderbolt-3-update-software-firmware . For more information about Thunderbolt 3 host system and motherboard compatibility, refer to the Thunderbolt 3 Compatibility and Troubleshooting guide .

What do I do if only the video portion of my Thunderbolt device is working?
When you connect a Thunderbolt™ device to any Windows operating system that can support Thunderbolt 3, a pop-up message appears. To use your Thunderbolt 3 device do one of the following: Select Connect Only Once . Select Always Connect . Caution! If you select Do Not Connect , only video will pass through on your Thunderbolt 3 device. If you accidentally set a Thunderbolt™3 device to not connect to your computer when prompted by the system, you can force the software to prompt you again for authentication. To do so, complete the following: Right-click the Thunderbolt icon. Click Approve Attached Devices . Select the Thunderbolt 3 port that you want to authenticate.

I received an error message stating that the Thunderbolt device I’m using is not certified for PC use. How do I resolve this issue?
If you receive an error message that your Thunderbolt device is not certified for PC use, try the following to resolve the issue: Click Start . Type Thunderbolt and click the search result. In the system tray, right-click the Thunderbolt icon. Click Settings . Clear the Only allow Thunderbolt Devices that have been certified for PC check box.

My DisplayPort displays are not working at 60Hz with this adapter. How do I resolve this issue?
To use a Thunderbolt 3 adapter to output to a display at 60Hz, your monitor must support the refresh rate and you need to set the monitor to work at 60Hz. By default, most monitors are set to DP1.1, which will not work with this Thunderbolt 3 device when you use a display at 60Hz. In most cases, you need to set your monitor's DisplayPort settings to DP1.2. To resolve this issue, use the buttons on your monitor to change the DisplayPort settings to DP1.2. For more information about changing your monitor settings, refer to the website of the manufacturer of your monitor.

How to Arrange Windows Monitors to Fix Mouse Issues
In order for your mouse to move properly between your monitors you must rearrange your monitors in Windows to match the physical location of your monitors on your desk. To do so, complete the following based on your operating system: Windows 11 Click on the Windows Icon in the Taskbar (or the Windows key on the keyboard) and search for Display Settings . Click on Multiple Displays. Click Identify to display the numbers on each connected monitor, showing how the operating system has assigned their positions. Click and drag the monitor icons to best match your physical setup. Click Apply to confirm the changes and close the window. Windows 10 and Windows 8 On your keyboard, press the Windows key + X and select Control Panel . Click Appearance and Personalization , then click Display . Click the Resolution or Adjust Resolution option from the left column, which will display your monitors as numbered icons. Click Identify to display the numbers on each connected monitor, showing how the operating system has assigned their positions. Click and drag the monitor icons to best match your physical setup. Click OK to apply the changes and close the window. Windows 7 and Windows Vista Click the Start button and select Control Panel . Click Appearance and Personalization, then click Display . Click the Resolution or Adjust Resolution option from the left column, which will display your monitors as numbered icons. Click Identify to display the numbers on each connected monitor, showing how the operating system has assigned their positions. Click and drag the monitor icons to best match your physical setup. Click OK to apply the changes and close the window. Windows XP Click the Start button and select Control Panel . Double-click Display . Click the Settings tab, which will display your monitors as numbered icons. Click Identify to display the numbers on each connected monitor, showing how the operating system has assigned their positions. Click and drag the monitor icons to best match your physical setup. Click OK to apply the changes and close the window. To mirror the image from your primary monitor instead of extending your desktop, refer to the following FAQ: http://www.startech.com/faq/Windows_Mirroring_Monitors

My DisplayPort display is not working when I try to output 4K at 30Hz with this device. How do I resolve this issue?
To output 4K to a DisplayPort display at 30Hz, your monitor must support the resolution and refresh rate. If your monitor also supports 4K at 60Hz (DP 1.2 or higher), you may also need to set the monitor to work at 30Hz. To resolve this issue, use the buttons on your monitor to change the DisplayPort settings to DP1.1. For more information about how to change your monitor settings, refer to the website of the manufacturer of your monitor.

How do I configure additional displays in Windows?
Windows 11 To configure displays in Windows 11, complete the following: Press the Windows + I (capital letter i) keys together to open Settings Click 'System' > 'Display' Click 'Duplicate these displays' and choose 'Extend these displays' (if needed). Click ‘Identify’ to determine the number assigned to each display. Drag and drop each display accordingly to the physical layout on your desk. Click the Apply button. Windows 10 To configure displays on Windows 10, complete the following: Press the Windows + I (capital letter i) keys together. Click 'System' > 'Display' Under the ‘Multiple displays’ section, select ‘Extend Desktop To This Display.’ Click ‘Identify’ to determine the number assigned to each display. Drag and drop each display accordingly to the physical layout on your desk. Click the Apply button.

How do I check which version of Thunderbolt 3 software, firmware, and drivers I am running in Windows?
To check which version of the Thunderbolt™ software, NVM firmware, and drivers you are running, do the following: Click Start . Type Thunderbolt and click on the search result. In the system tray, right-click the Thunderbolt icon. Click Settings > Details . Review the versions of the software package, NVM firmware, PD firmware, and drivers. If you are not running the latest versions, navigate to the manufacturer’s website and download the latest versions.

When I connect my Thunderbolt 3 device to my Windows computer, I get pop-up messages. What do I do?
When you connect a Thunderbolt™ device to any Windows operating system that can support Thunderbolt 3, a pop-up message appears. To use your device, complete the following: In the New Thunderbolt devices have been attached pop-up message, click OK . In the User Account Control pop-up message, click Yes . In the Approve Thunderbolt Devices pop-up message, do one of the following: If you want to authorize your Thunderbolt devices every time that you connect them, select Connect Only Once in the drop-down list. If you want to authorize your Thunderbolt devices only once, select Always Connect in the drop-down list. Click OK . If you accidentally set your Thunderbolt device to Do Not Connect in step three above, refer to the following FAQ: https://www.startech.com/faq/thunderbolt-3-denied-authentication .

What do I do if I accidentally set my Thunderbolt 3 device to Do Not Connect and it stops working?
If you accidentally set a Thunderbolt™3 device to not connect to your computer when prompted by the system, you can force the software to prompt you again for authentication. To do so, complete the following: Right-click the Thunderbolt icon. Click Approve Attached Devices . Select the Thunderbolt 3 port that you want to authenticate.

How do I manage my authenticated Thunderbolt 3 devices in Windows?
You can use the Thunderbolt™ software to manage your Thunderbolt 3 devices on a computer running a version of Windows. To manage your Thunderbolt 3 devices, complete the following: Click Start . Type Thunderbolt and click on the search result. Right-click the Thunderbolt icon. Click Manage Approved Devices .

Can I use a Thunderbolt 3, Thunderbolt 4, or Thunderbolt 5 device on a USB-C or USB4 port?
No, a Thunderbolt 3, Thunderbolt 4, or Thunderbolt 5 device requires a Thunderbolt-enabled port and will not work on a USB-C port that does not support Thunderbolt. Explanation: Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 use the USB-C connector, but they require Thunderbolt protocol support from the host port, cable, and device. Compatibility rules are as follows: A Thunderbolt device (Thunderbolt 3, 4, or 5) only works when connected to a Thunderbolt-enabled USB-C port. A standard USB-C port without Thunderbolt support does not support Thunderbolt devices and will result in no functionality. USB-C devices are compatible with Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 ports because Thunderbolt includes USB support. USB4 ports may support Thunderbolt 3 devices, but this support is optional and not guaranteed. USB4 does not ensure compatibility with Thunderbolt 4 or Thunderbolt 5 devices. To confirm compatibility, look for the Thunderbolt symbol on the host port, cable, and device. If the Thunderbolt symbol is not present, the connection supports USB-C only and does not support Thunderbolt devices. All components in the connection must support the required Thunderbolt standard to ensure proper operation and full performance.

What is Thunderbolt, and how do Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 differ?
Thunderbolt is a high-performance connectivity standard that combines data, video, networking, and power delivery over a single connection. Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 all use the USB-C connector, but each generation offers different performance capabilities, certification requirements, and feature sets. Explanation: Thunderbolt is an Intel-developed connectivity technology that enables high-speed communication between computers, displays, storage devices, docking stations, and other peripherals through a single cable connection. Thunderbolt combines multiple technologies, including: PCI Express (PCIe) data transfer DisplayPort video USB data connectivity Power delivery The following table compares the capabilities of Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5: Feature Thunderbolt 3 Thunderbolt 4 Thunderbolt 5 Maximum Bandwidth Up to 40Gbps Up to 40Gbps Up to 80Gbps (120Gbps with Bandwidth Boost) USB Compatibility Up to USB4 Up to USB4 Up to USB4 Version 2.0 Display Support Up to two 4K displays or one 5K display Up to two 4K displays or one 8K display Up to three 4K displays, multiple 8K displays, or higher resolutions depending on device support PCIe Bandwidth Up to 32Gbps Minimum 32Gbps required Up to 64Gbps Power Delivery Up to 100W (device dependent) Up to 100W (device dependent) Up to 240W supported with USB Power Delivery 3.1 Extended Power Range on supported devices Daisy Chaining Up to six devices Up to six devices Up to six devices Thunderbolt 4 maintains the same maximum bandwidth as Thunderbolt 3 but introduces stricter certification requirements, including: Support for dual 4K displays or one 8K display PCIe bandwidth requirements for storage devices Wake-from-sleep support through Thunderbolt peripherals Mandatory support for docks with multiple Thunderbolt ports Enhanced security protections against direct memory access (DMA) attacks Thunderbolt 5 significantly increases available bandwidth and is designed for high-performance applications such as: Professional content creation High-resolution multi-display environments AI and workstation workloads External GPU and high-speed storage connectivity USB-C and Thunderbolt Compatibility Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 all use the USB-C connector. However, a USB-C connector alone does not indicate Thunderbolt support. A device may include a USB-C port that supports: USB 2.0 USB 3.2 USB4 Thunderbolt 3 Thunderbolt 4 Thunderbolt 5 The capabilities of a USB-C port depend on the hardware implementation of the host device. In general: USB devices can typically connect to Thunderbolt ports. Thunderbolt devices require a Thunderbolt-compatible host to access Thunderbolt functionality. A USB-C host that does not support Thunderbolt cannot provide Thunderbolt features to a Thunderbolt peripheral. Thunderbolt-certified ports and devices are typically identified by the Thunderbolt logo next to the USB-C connector. Backward Compatibility Thunderbolt maintains broad backward compatibility across generations: Thunderbolt 5 is compatible with Thunderbolt 4, Thunderbolt 3, USB4, and USB-C devices when supported by the host and device. Thunderbolt 4 is compatible with Thunderbolt 3 devices. Thunderbolt 3 can connect to Thunderbolt 1 and Thunderbolt 2 devices using an appropriate adapter. Thunderbolt 1 and Thunderbolt 2 hosts cannot fully support Thunderbolt 3, Thunderbolt 4, or Thunderbolt 5 devices without compatible hardware and adapters. Actual performance depends on the capabilities of the host computer, peripheral device, cable, and software environment.

Thunderbolt 3 vs. USB-C Ports: What's the Difference?
USB-C and Thunderbolt are not the same technology. USB-C is a connector type, while Thunderbolt is a connectivity standard that uses the USB-C connector. Not all USB-C ports support Thunderbolt, but Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 ports all use the USB-C connector and support USB devices. Explanation: A common source of confusion is that USB-C and Thunderbolt ports look identical because they use the same physical connector. However, the connector shape does not determine the capabilities of the port. USB-C is a connector standard that can support a variety of technologies, including: USB 2.0 USB 3.2 USB4 DisplayPort Alternate Mode (DP Alt Mode) USB Power Delivery (USB PD) Thunderbolt 3 Thunderbolt 4 Thunderbolt 5 The actual features available depend on the hardware implementation of the computer, cable, and connected device. Compatibility In most cases: USB devices can connect to Thunderbolt 3, Thunderbolt 4, and Thunderbolt 5 ports. Thunderbolt ports support USB functionality in addition to Thunderbolt functionality. Thunderbolt devices require a Thunderbolt-compatible host to access Thunderbolt features. A USB-C port that does not support Thunderbolt cannot provide Thunderbolt functionality to a Thunderbolt device. As a result, a USB-C device will generally work when connected to a Thunderbolt port, but a Thunderbolt device may not function correctly when connected to a USB-C port that does not support Thunderbolt. How to Identify a Thunderbolt Port Thunderbolt-certified ports typically display a Thunderbolt logo next to the USB-C connector. To determine whether a computer, cable, or device supports Thunderbolt: Look for the Thunderbolt symbol on the port or cable. Check the product specifications provided by the manufacturer. Review the technical documentation for the computer or device. Because USB-C ports can support a wide range of capabilities, checking the product specifications is the most reliable way to confirm support for Thunderbolt, USB4, display output, charging, or other advanced features. Thunderbolt symbol:

Can this device increase the maximum number of displays supported by my video card?
No, this device cannot increase the maximum number of displays supported by a video card or graphics processor. The maximum number of displays in a system is determined by the capabilities of the graphics hardware and its drivers. Explanation: This device can provide additional display connectivity, but it does not increase the display limit imposed by the video card, integrated graphics processor (GPU), or graphics drivers. For example, if a graphics adapter supports a maximum of three displays, connecting this device will not increase that limit. The system will still support a maximum of three active displays. If you have connected multiple instances of this device and are experiencing display detection, activation, or performance issues, verify that the graphics hardware in your computer supports the total number of displays connected. To determine the maximum number of supported displays, consult the specifications for your graphics card, integrated graphics processor, or computer manufacturer documentation.

Are there any known compatibility requirements or limitations for this device?
Yes. This device requires a Thunderbolt host system that can provide 15W of bus power through its Thunderbolt port. Systems that do not provide the required 15W of bus power may not function correctly with this device. Explanation: This device is powered through the Thunderbolt connection and relies on the host computer to supply sufficient bus power. To operate properly, the Thunderbolt host system must provide: A compatible Thunderbolt port A minimum of 15W of bus power through that port Thunderbolt power capabilities vary by computer manufacturer, model, and Thunderbolt implementation. The Thunderbolt version (Thunderbolt 3, Thunderbolt 4, or Thunderbolt 5) alone does not guarantee a specific bus power output. Before deployment, verify the Thunderbolt port specifications provided by the computer manufacturer to confirm that the required 15W of bus power is supported.

Why is only one external display working with my Apple M1 or M2 Mac?
Late 2020 models of MacBook Air, MacBook Pro 13-inch, and Mac Mini systems using the original Apple M1 or 2022 models of MacBook Air, and MacBook Pro using the Apple M2 chip support only a single external display over the Thunderbolt 3 ports, even when connected to a Thunderbolt 3 docking station or adapter with more than one video output. This limitation also applies to using multiple Thunderbolt or USB Type-C display adapters on both Thunderbolt/USB Type-C ports. This is not a limitation of StarTech.com products specifically, and Apple lists support for only one external display in the Tech Specs for Video Support on the M1 MacBook Pro 13” [external link to apple.com]. Turning off the laptop display or using clamshell mode does not change this. One option that allows for more than one external display with an Apple M1 or M2 silicon is to use a USB-C DisplayLink-based docking station or video adapter that requires a driver install. One dual monitor example is our DK30CHDDPPD, but please contact StarTech.com support for a recommendation based on your specific setup. Please note: this single monitor limitation does not affect Intel-based Macs with Thunderbolt 3, or later M1 and M2 models that ship with M1 Pro, M1 Max, M1 Ultra, M2 Pro, or M2 Max processors.