• Overview
  • Tech Specs
  • eGPU/OS Info
  • Accessories
  • Videos/Reviews


Connect a High-Performance GPU Card or Other Bandwidth-Hungry PCIe Card to a Thunderbolt™ 3 Equipped Computer

Thunderbolt 3 Notebooks

Sonnet’s eGFX Breakaway Box Thunderbolt 3 to eGPU PCIe card expansion systems are designed specifically to accommodate large and power-hungry GPU cards. Functioning as a simple plug-in upgrade, a Breakaway Box boosts the graphics performance of an eGFX-compatible computer by connecting a high-performance desktop GPU card via a Thunderbolt 3 port. With four models to choose from, the Breakaway Box line supports all Thunderbolt-compatible cards(1) with popular GPU chipsets—such as AMD Radeon™ R9 and RX series, including VEGA 64 and Frontier Edition; and NVIDIA® GeForce® GTX 9 and 10 series, and TITAN X, Xp, and V. Even the latest pro cards—AMD Radeon Pro WX 5100, WX 7100, WX 9100, and SSG; and NVIDIA Quadro® GP100, P4000, P5000, and P6000—are supported! Alternatively, if you are need a cost-effective Thunderbolt expansion system for a Thunderbolt-compatible, non-GPU PCIe card, the Breakaway Box offers all the space and power you could possibly need at an affordable price.


Supports AMD XCONNECT Technology

Graphic Intensive Gaming

Gamer with eGFX Breakaway BoxThere’s no need for you to carry a heavy and expensive gaming laptop to have a great gaming experience—just plug in a Breakaway Box and add the GPU power you want when you need it! By delivering significantly higher frame rates for smooth game play, the Breakaway Box is ideal for enabling graphic-intensive gaming on Ultrabook™ and other thin/light notebook computers that otherwise would deliver a poor gaming experience. When used with an eGFX-compatible computer, accelerated graphics can either be displayed on your notebook’s own display panel or on multiple external monitors. And, unlike with gaming laptops, when the next generation of GPUs ships and you are ready for another performance boost, simply upgrade the GPU card in the Box—nobody should have to replace their computer just to keep up with the latest in GPU technology.

eGFX Breakway PuckCompact Integrated eGPU

For a highly-portable eGPU solution, check out Sonnet’s eGFX Breakaway Pucks

Learn MoreArrow

Ready for Work

PCIe Card and Notebook Icons

From editing to rendering to color grading, and from animation to special effects, many applications rely on GPU cards to do the heavy lifting. With a GPU card installed, the Breakaway Box can accelerate your video production workflow. In addition to GPU cards, the Breakaway Box supports every other Thunderbolt-compatible PCIe card, up to full-length, full-height, double-width—its single x16 PCIe 3.0 slot easily accommodates full-length cards such as the Avid® Pro Tools|HDX(5) or RED® ROCKET-X. The Breakaway Box’s single-port 40Gbps Thunderbolt 3 interface ensures the full 2750 MB/s of PCIe bandwidth(2) is dedicated to the installed card.

eGFX Breakaway Box Internal Fan


Coolest & Quietest eGFX Graphics Card Box on the Market

The Sonnet eGFX Breakaway Box is the coolest and quietest eGFX box on the market—with its large variable-speed, temperature-controlled fan that quietly and effectively cools the installed card, the Breakaway Box can be comfortably used in noise-sensitive working environments.


Key Features

Connects High Performance GPU Cards to Computers with Thunderbolt 3 Ports—Boosts the graphics performance of your eGFX-compatible computer with Thunderbolt 3 ports

Supports the Latest GPU Cards—Includes AMD Radeon R9, RX, RX Vega, and Pro WX models; and NVIDIA GeForce GTX 9 and 10 series, TITAN X, Xp, V, and Quadro models

Supports Other Thunderbolt-Compatible PCIe Cards—Supports full-length, full-height, single- or double-width card, perfect for cards such as the Avid Pro Tools|HDX(5) or RED ROCKET-X

40Gbps Thunderbolt 3 Interface With One Thunderbolt 3 Port—Ensures full 2750 MB/s of PCIe bandwidth(2) is dedicated to the installed card

Choice of Four Models—Add-your-own-card eGFX Breakaway Box models with various wattage power supplies and Power Deliveries, plus the Developer Edition with included Sapphire PULSE Radeon RX 580 8GB card, are available

Quietest eGFX System Available—Large built-in, variable-speed, temperature-controlled fan quietly and effectively cools the installed card

Thunderbolt Certified


Liquid Coolers Supported

eGFX Breakaway Box with Mac Pro In Video Editing Studio

For Media Professionals

In today’s pro audio and video production, use of audio I/O and DSP cards (such as the Avid Pro Tools|HDX), and video I/O and transcoding cards (such as the or RED ROCKET-X) is essential to keeping up with recording sessions, as well as on-set and post-production timelines. The eGFX Breakaway Box is ideal for supporting the acceleration of these workflows.

40Gbps Thunderbolt 3 Performance

Thunderbolt 3 Port IconThunderbolt 3 is a leap forward in every way. Whether you’re editing high-frame-rate 4k video, or blasting aliens out of the sky, you can now transform your notebook into a true desktop experience. With up to 2750 MB/s available PCIe bandwidth(2), the Breakaway Box exploits its 40Gbps Thunderbolt 3 interface to offer the best-possible eGPU experience, or handle the most demanding, highest performance PCIe cards.

Four Models From Which to Choose

All models are Thunderbolt Certified, and include a 0.5-meter Thunderbolt 3 (40Gbps) cable to connect the system to your computer. Choose the one that best suits the power requirements of the card you intend to use, or you can opt for the model with an included GPU card!

eGFX Breakaway Box

eGFX Breakaway Box 550

eGFX Breakaway Box

Includes one 8-pin (6+2 pin) plus one 6-pin auxiliary power connectors; supports cards requiring up to 300W of power (equivalent to 500W [sometimes 600W] recommended system power); and provides 15W of upstream power. This model provides enough power for most GPU cards; see the list of cards supported on the eGPU/OS tab.

eGFX Breakaway Box 550

Includes two 8-pin (6+2 pin) auxiliary power connectors; supports cards requiring 375W of power (equivalent to 600W recommended system power); and provides 87W of upstream power, useful for charging your notebook. This model supports nearly every compatible GPU card, with the exception of ones such as the AMD Radeon RX Vega 64, Vega Frontier Edition, WX 9100, and overclocked NVIDIA cards with extremely high peak power requirements; see the list of cards supported on the eGPU/OS tab.

eGFX Breakaway Box 550

eGFX Breakaway Box (Developer Edition with Radeon RX 580 Card)

eGFX Breakaway Box 650

Includes two 8-pin (6+2 pin) auxiliary power connectors; supports cards requiring 375W of continuous power plus an additional 100W peak power (equivalent to 750W recommended system power); and provides 87W of upstream power, useful for charging your notebook. AMD approved for the air-cooled editions of the AMD Radeon RX Vega 64, Vega Frontier Edition, and Radeon Pro WX 9100, this model was designed and qualified to also support overclocked NVIDIA cards with high peak power requirements; see the list of cards supported on the eGPU/OS tab.

eGFX Breakaway Box
(Developer Edition)

Includes a Sapphire Pulse Radeon RX 580 8GB card, and provides 60W of upstream power. (Belkin USB-C to 4-port USB-A hub provided with original Apple External Graphics Development Kit not included.)


Power IconCurious to know how much power your eGPU card really needs? Watch our video to learn more.

eGFX Breakaway with Notebook & Three Monitor Setup

Fire Power to Drive Multiple Displays and Charge Your Notebook

Part No.  

eGFX Breakaway Box

  • Equivalent to 500W (sometimes 600W) recommended system power
  • One 8-pin (6+2 pin) plus one 6-pin
    power connector
  • Supports up to 300W card
  • Provides laptop charging up to 15W


eGFX Breakaway Box 550

  • Equivalent to 600W recommended
    system power
  • Two 8-pin (6+2pin) power connectors
  • Supports up to 375W card
  • Provides laptop charging up to 87W


eGFX Breakaway Box 650

  • Equivalent to 750W recommended system power
  • Two 8-pin (6+2 pin) power connectors
  • Supports up to 375W card that also requires up to an additional 100W of peak power
  • Provides laptop charging up to 87W


eGFX Breakaway Box (Developer Edition)

  • Includes Sapphire PULSE Radeon
    RX 580 8GB card
  • Equivalent to 400W (sometimes 500W) recommended system power
  • One 8-pin (6+2 pin) power connector
  • Supports up to 225W card
  • Provides laptop charging up to 60W

Note: Does not include Belkin USB-C to 4-port USB-A hub

Warranty 1-year
Form Factor Desktop Thunderbolt 3 to PCIe card expansion system
External Connectors
  • One Thunderbolt 3
  • Power (C14-type)
Expansion Slot One PCIe 3.0 slot
  • x16 Mechanical
  • x4 Electrical (Thunderbolt 3 Spec)
PCIe Card Supported One full-length, full-height, double-width PCIe card
Liquid Cooling (Liquid Cooling Support) Supports 120mm x 1 Water Block Coolers
Input Power
Universal 110-240V AC, 50-60 Hz
Eco-Friendly Power Management
See video for description
Operating Temperature

0˚C to 35˚C (32˚F to 95˚F)

Dimensions (WxDxH) 7.25 x 13.38 x 8 in. (18.5 x 34.0 x 20.2 cm)
Weight   7.1 lbs (3.2 kg)
RoHS Compliant Yes
Package Contents
  • eGFX Breakaway Box system
  • Power cord
  • 0.5-meter Thunderbolt 3 (40Gbps) cable
  • Documentation

Note: PCIe cards sold separately, except for Developer Edition

Specifications subject to change without notice






Technical Questions?
Contact us at 1-949-587-3500 x2 or email to confirm card and computer compatibility.

Mac Compatibility

Breakaway Box, Breakaway Box 550, Breakaway Box 650

Mac with Thunderbolt 3 ports and macOS 10.13.3+

macOS 10.13.3 is still beta for external GPU support and select AMD cards are not yet officially compatible for use over Thunderbolt
macOS drivers for NVIDIA GPU cards are currently not compatible with Thunderbolt Technology

Mac with a Thunderbolt 2 or Thunderbolt port with an Apple Thunderbolt 3 to Thunderbolt 2 Adapter and macOS 10.12.6+ (external GPUs not supported by TB2 or TB Macs)

Certified with all generation Thunderbolt Macs to support Thunderbolt-compatible non-GPU cards, such as AVID HDX(5) and RED ROCKET-X.

Breakaway Box (Developer Edition)

Mac with Thunderbolt 3 ports and macOS 10.13.3+

Includes Sapphire Pulse Radeon RX 580 8GB card

External GPU support is beta until Spring 2018(3)

Supported by Sonnet

Windows Compatibility

All Models

Windows PC with a Thunderbolt 3 port

GPU card use requires an eGFX-enabled Windows PC

Windows 10 (64-bit Edition, Version 1709 or greater)

Technical Notes

  1. eGFX Breakaway Box models support up to a standard full-height, full-length, double-width card. Cards with three power connectors are not supported.
  2. While the eGFX Breakaway box features a 40Gbps Thunderbolt 3 interface, some computers equipped with Thunderbolt 3 use an x2 PCIe lane implementation of Thunderbolt 3 technology that limits PCIe performance to 20Gbps. Find more computer information here. Full performance also requires the use of the included Thunderbolt 3 (40Gbps) cable, or other Thunderbolt 3 (40Gbps) cables; look for the Thunderbolt icon AND the number 3 on the connector housings to identify these cables.
  3. For more information, see Sonnet Support Library.
  4. Choose eGFX Breakaway Box model that supports the power requirement of the chosen card.
  5. Power adapter cable for Avid Pro Tools|HDX card sold separately.

Mac LogoWindows Logo PCI Express Logo
PSE & Wheele Trash Can IconsroHS Logo




GPU Card Family Support(4)
AMD Pro GPU Cards
AMD Radeon Pro WX9100
AMD Radeon Pro WX7100
AMD Radeon Pro WX5100
AMD Radeon Pro SSG
AMD Radeon Vega Frontier Edition
AMD Radeon RX Vega 64
AMD Radeon RX Vega 56


AMD Consumer GPU Cards
AMD Radeon RX 580
AMD Radeon RX 570
AMD Radeon RX 560
AMD Radeon RX 480
AMD Radeon RX 470
AMD Radeon RX 460
AMD Radeon R9 Fury
AMD Radeon R9 Nano
AMD Radeon R9 285
AMD Radeon R9 290x
AMD Radeon R9 290

NVIDIA Quadro Logo
NVIDIA Quadro P6000
NVIDIA Quadro P5000
NVIDIA Quadro P4000
NVIDIA Quadro GP100

NVIDIA Consumer GPU Cards
NVIDIA GeForce GTX 1080 Ti NVIDIA GeForce GTX 1080
NVIDIA GeForce GTX 1070
NVIDIA GeForce GTX 1060
NVIDIA GeForce GTX 1050 Ti
NVIDIA GeForce GTX 1050
NVIDIA GeForce GTX 980 Ti
NVIDIA GeForce GTX 980
NVIDIA GeForce GTX 970
NVIDIA GeForce GTX 960
NVIDIA GeForce GTX 950

See eGPU/OS Info tab for details. Future cards listed as they become available.

Other PCIe Cards

PCIe cards listed on our supporting PCIe Card Thunderbolt Compatibility Chart and as specified by card manufacturers.




HP Notebook with eGFX Breakaway Box
eGPU Card and OS Info

Find video card and operating system (OS) information for eGFX Breakaway Box models



Graphics Card Compatibility
List of AMD and NVIDIA GPU cards arranged by card manufacturer, compatibility determined by the card’s power requirements and Breakaway Box model’s power capabilities (PDF).

macOS eGPU Info
External graphics support for macOS is currently beta, supporting only the eGFX Breakaway Box Developer Edition, which is plug-and-play with Thunderbolt 3 Macs under macOS High Sierra, subject to the beta release notes.

Windows eGPU Info
Thunderbolt 3 PC and eGPU installation info.

Documentation & Support Resources:
Step-by-step card installation instructions, FAQs, and other support resources

Card Installation Quick Start Guide (English/French/German/Spanish/Japanese, PDF)

General information and known issues (PDF)


Share your experience with the community!
Please share whether you were successful and which computer and graphics card you were using by joining our Facebook eGFX Breakaway Box community: https://www.facebook.com/SonnetTech/






Accessories Part No. Description
8GB Radeon Sapphire card Radeon RX 580 Graphics Card SP-RX580-8GB Sapphire PULSE Radeon RX 580 8GB Graphics Card
(Developer Edition)
HDX Power Cable Avid Pro Tools|HDX PCIe Card Power Adapter Cable TCB-HDXB Avid Pro Tools|HDX PCIe Card Power Adapter Cable









Sonnet eGFX Breakaway Box Videos

External GPU Use - How Much Power Does My eGPU Card Really Need? (3:57 mins)


Eco Friendly Power Features (1:24 mins)


View More Sonnet VideosArrow

Sonnet eGFX Breakaway Reviews


First Look at Apple's External GPU Developer's Kit for the
macOS High Sierra beta

The Sonnet kit is very quiet. Previous enclosures have demanded enormous tidal volumes of air, with one we tested able to push a box of tissue across the desk when under load. In the interest of performance, up to now we've borne that burden—but no longer…

Read Full ReviewLink

Bare Feats

What Did We Learn?

The eGFX Breakaway Box with the NVIDIA GeForce GTX 1080 Ti and connected to a Mac can speed up multi-GPU rendering in apps like Blender and Resolve (Noise Reduction render on the fly during playback); add CUDA support to your AMD equipped Macs thereby enabling 'CUDA only' apps like Octane Render to function and 'CUDA capable' apps like Blender to function faster than the "OpenCL only" AMD GPUs provided by Apple; provide a surge in the OpenCL render rate as well as combine with factory AMD GPUs to double the render rate; and triple and quadruple the frame rates of OpenGL apps like Valley and Tomb Raider.

Sonnet Technologies came up with their own unique eGPU design. It includes all the best eGPU features such as quiet exhaust fan and the ability to send power to your 2016 MacBook Pro laptop. An nice touch was the PCIe Card Bracket Locking Plate.

Unlike other eGPUs, the eGFX Breakaway Box does not require you to run the tb3-enabler in order to be detected as a supported Thunderbolt device.

Read Full ReviewLink


Sonnet Breakaway Box 350 Review – It's Cool to Be Quiet

Priced at $299, the Sonnet Breakaway Box is an eGPU enclosure whose single purpose is to provide graphics performance boost through its sole Thunderbolt 3 port. For first impressions and additional photos, check out the unboxing post. The two components of this enclosure worth paying close attention to are the PSU and the main cooling fan. Both are built by Akasa, a supplier of thermal solutions to the electronics industry. The power supply is a 350W SFX unit. It’s custom-made to have one 24-pin main power cable, one 6-pin PCIe cable, and one 6-pin + 2 PCIe cable.

The 120mm fan is rated for 6.9 -16.05 dB(A), with 10 dB being the noise of a pin dropping. Airflow is routed out of the enclosure space behind the GPU and in front of the PSU. This main cooling fan is inaudible to my ears when a powerful graphics card is in use. Another cool aspect of the thermal control system is the fan bracket. It’s very sturdy which helps prevent vibration.

I’ve been using this Sonnet Breakaway + RX 580 eGPU setup for the past week. It has been a reliable, capable and quiet workhorse with the Late 2013 Mac Pro trashcan…

Read Full ReviewLink



Ideal for Accelerating

• Special effects
• Animation
• Color grading
• Rendering
• Editing

Also Ideal for Enabling Graphic Intensive Gaming
on Non-Gaming Computers:

• Enables high frame rate gaming with Ultrabook™ and other
   thin/light notebook computers
• Accelerated graphics on notebook display or external display
• No need to carry around a heavy/expensive gaming
   laptop—connect GPU power when you need it

 PCIe cards and computer hardware shown in photos for illustration purposes; items sold separately. Thunderbolt and the Thunderbolt logo are trademarks
of Intel Corporation in the U.S. and/or other countries. Other names and brands may be claimed as the property of others.
See Tech Specs Tab for footnotes