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Connect Two 4K Displays from a Single
Thunderbolt Port on a Mac or PC

Sonnet’s Thunderbolt™ Dual DisplayPort Adapter is certified for use with both Mac® and Windows® Thunderbolt equipped computers, and enables you to connect two displays to a single Thunderbolt port on your computer. With the adapter connected, you can connect two 4K @ 60Hz DisplayPort monitors, or two 1440p @ 144Hz monitors.

Work Efficiently

Display with Apps Windows IconWhether you need to view your work across two displays, or you need to view it with the highest resolution possible, this Sonnet plug-and-play adapter enables you to work more efficiently. With two displays attached, you can fill one with full-screen workspace, and use the other for tools, other applications, and more.

Convenient – No External Power
Adapter Required

To use it, simply plug in the Sonnet Thunderbolt Dual DisplayPort Adapter into one of your computer’s Thunderbolt ports, and connect DisplayPort cables (sold separately) between the adapter and your monitors. Your computer powers the Sonnet adapter, so there’s no need to connect an additional power adapter.


Thunderbolt Certified for Mac® and Windows®, the Sonnet Thunderbolt Dual DisplayPort Adapter can be used with the latest and best computers available. If you need to connect a monitor without a DisplayPort (DP) input, the Sonnet dual DisplayPort adapter is compatible with active DP-to-HDMI, DP-to-DVI, and DP-to-VGA adapters. And, unlike USB adapters, the Sonnet adapter won’t drain system resources that might impact your computer’s performance.

Key Features

Connects Two DisplayPort Displays to a Single Thunderbolt Port—Enables connection of two 4K DisplayPort (DP) displays @ 60Hz, or two 1440p @ 144Hz display to a single Thunderbolt port on your computer

Compatible with Both Mac and Windows—Thunderbolt certified for use with macOS and Windows computers with Thunderbolt ports

Enables You to Work More Efficiently—Fill one display with full-screen workspace; use the other for tools, other applications, etc.

No Power Adapter Required—Sonnet adapter draws power from Thunderbolt port

Backward-compatible with 1080p HD Displays
Great for use for different home and office workspace applications

Compatible with Active HDMI, DVI and VGA
—Enables connection of non-DisplayPort displays

Built In Audio Support—No need to connect additional cables, audio signal passed over DisplayPort connection to display that has audio output capabilities

Compact and Rugged Design—Portable aluminum enclosure with two DisplayPort connectors


Connect One 5K or Two 4K or Full HD Displays

Adapts to Your Needs

Although the Sonnet adapter supports two monitors at resolutions up to 4096 x 2160 (4K), you can also use it to connect monitors with lower resolution, like 1440p or 1080p monitors at higher refresh rates. This makes it great for use for different home and office workspace applications. And, with built-in audio support, there’s no need for you to connect an additional cable to hear sound from the monitors.


Thunderbolt 3 to Dual DisplayPort Adapter

 Computer hardware shown in photos for illustration purposes; items sold separately.
See Tech Specs Tab for footnotes
Part No.  
TB3-DDP4KG Sonnet Thunderbolt Dual DisplayPort Adapter
Warranty 2-year
Form Factor Display adapter
Bus Interface 40Gbps Thunderbolt
External Connectors Two DisplayPort ports
Standard DisplayPort 1.2 and HDCP 2.2(1)
Supported Resolutions(2)
  • 4K @ 60Hz
  • 1440p @ 144Hz
  • 1080p @ 240Hz
Dimensions (WxDxH) 2.3 x 3.9 x 0.6 in. (59 x 99 x 16 mm)
Dimensions, Cable (Length) 11.8 in. (300 mm)
RoHS Compliant Yes
Package Contents
  • Thunderbolt Dual DisplayPort Adapter
  • Documentation


Specifications subject to change without notice.






Mac Compatibility

Intel® 15" and 16" MacBook Pro, iMac Pro with four Thunderbolt 3 ports, and M1 Ultra Mac Studio support four 4K monitors with two Sonnet adapters

All other Intel Macs with Thunderbolt 3 ports support two 4K monitors with one Sonnet adapter

M1/M2 Pro and M1/M2 Max Macs support two 4K monitors with one Sonnet adapter

M1 and M2 Macs are not compatible. Use Sonnet's DisplayLink Dual DisplayPort Adapter for M1 Macs

macOS® 10.12+

macOS Sonoma compatible

Windows Compatibility

Windows PC with Thunderbolt 4 or Thunderbolt 3 ports

Windows 11 or 10

Monitor Compatibility

EDID Version 1.4(3)

Technical Notes

  1. macOS supports HDCP only with iTunes.
  2. Other common resolutions are also supported.
  3. EDID stands for Extended Display Identification Data. This is how the monitor identifies its resolution modes to the adapter. EDID Version 1.4 was finalized in 2006. If your HDMI monitor is more than 10 years old, it will likely not be supported.

Mac LogoWindows Logo PCI Express LogoroHS Logo




Product Quick Overview - Thunderbolt 3 to Dual DisplayPort Adapter (1:49 mins)

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