eGPU Breakaway Box 750

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eGPU Breakaway Box 750 (eGPU Expansion System)
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Pro Power Graphics – Add a High-performance Video Card to Create Your Own Personal eGPU Workstation

Whether you’re editing, rendering, color grading, animating or creating special effects, many of the pro applications you use rely on desktop and workstation graphics (GPU) cards to do the heavy lifting in processing data. Unfortunately, many popular computers are equipped only with integrated graphics or low-power discrete GPUs that bottleneck performance when performing these tasks. Happily, there’s a simple path to greater productivity—add a Sonnet external GPU (eGPU). The eGPU Breakaway™ Box 750 Thunderbolt 3 to GPU PCIe card expansion systems boost your eGPU-compatible computer’s graphics performance by connecting a high-performance GPU card to your computer via a single cable.

Designed for GPU Cards, Also Supports Other Demanding PCIe Cards

The Breakaway Box’s single x16 PCIe 3.0 slot accommodates full-length, double-width cards, and its 750W power supply supports trouble-free operation. Its single-port 40Gbps Thunderbolt 3 interface ensures the full 2750 MB/s of PCIe bandwidth is dedicated to the installed card.

Why Sonnet?

Sonnet maintains a working relationship with Thunderbolt and graphic cards partners, and is one of the first eGPU enclosures recommended by Apple®. Apple demonstrated eGPU connectivity over Thunderbolt 3 with Sonnet's eGFX Breakaway Box at Apple's 2017 WWDC (World Wide Developers Conference). The Breakaway Box was provided as an eGPU kit to developers to assist in the development of eGPU on Mac® computers.


eGPU Breakaway Box 750 Key Features:


Includes two 8-pin (6+2 pin) auxiliary power connectors

750W power supply; supports cards requiring up to 375W of continuous power plus an additional 100W peak power

Provides 100W of upstream power (useful for charging your notebook)

AMD approved for the air-cooled editions of the AMD Radeon RX Vega 64, Radeon Pro WX 8200, and WX 9100

Designed to also support overclocked NVIDIA cards with high peak power requirements

See the list of Supported GPU Cards (PDF)

Product Overview


One x16 Mechanical (x4 Electrical, Thunderbolt 3 Spec) PCIe 3.0 Slot

Supports One Full-length, Full-height, Double-width PCIe Card

Quiet, Temperature-controlled Fan

One Thunderbolt 3 Port

0.7-meter Thunderbolt 3 (40Gbps, 100W) Cable

Eco-friendly Power Features

Thunderbolt Certified

Mac and Windows Compatible

2-year Product Warranty

Free Lifetime Customer Technical Support

Designed in the USA

Coolest and Quietest Add-your-own-card eGPU System Available

With its large variable-speed temperature-controlled fan that quietly and effectively cools the installed card, the eGPU Breakaway Box can be comfortably used in noise-sensitive working environments.

Eco-friendly Thunderbolt 3 Power Features

Thunderbolt 3 provides eco-friendly power features to help save power and energy: the enclosure powers on when your computer is on and powers off when the computer is put to sleep, shut down, or disconnected. In addition, Thunderbolt 3 Power Delivery (PD) allows the Breakaway Box to power and charge notebook computers when the computer is sleeping.

Mac Compatibility


macOS Big Sur compatible

Mac with Thunderbolt 3 ports and macOS 10.13.6+

Automatically accelerates AMD RX eGPU connected monitors,and games and select apps run on those monitors(3)

macOS drivers for NVIDIA GPU cards are not compatible withThunderbolt Technology

One eGPU Breakaway Box (WX9100, for example) supports up tosix external 4k monitors @60Hz

Mac with Thunderbolt 3 ports and macOS 10.14.6+ (Mac minisee note 10)

Additional Features:

Support added for AMD RX 560 and RX 590 AMD GPUs

Accelerate games and applications run on the internaldisplay (or Thunderbolt Display) by selecting the App, selecting Get Info,and checking Prefer External GPU(4)

Windows 10 support under Parallels Desktop for Mac(5)

Support for two eGPU Breakaway Box eGPUs and up to twelveexternal 4k monitors @60Hz

Mac with Thunderbolt 3 ports and macOS 10.15.7+

Additional Features:

Support added for AMD RX 5500, 5500 XT, 5600, 5600 XT, 5700,5700XT

Apple M1 Macs do not yet support eGPUs

Supports VIVE and VIVE Pro with AMD Radeon RX480 orbetter(6)

External GPUs not supported by Thunderbolt 2 or Thunderboltequipped Macs(7)

External GPUs not supported on Windows 10 under Boot Camp

Certified with all generation Thunderbolt Macs to supportThunderbolt-compatible non-GPU cards, such as AVID HDX(8) and RED ROCKET-X

Windows Compatibility


Windows PC with a Thunderbolt 3 port

GPU card use requires an eGPU-enabled Windows PC

Windows 10 (64-bit Edition, Version 1809 or greater)

Supports VIVE and VIVE Pro with NVIDIA GTX 1060 or AMDRadeon RX 480 or better(6)

Monitor Compatibility


1080P monitors using DP or HDMI ports

4K and 5K monitors using DP or HDMI ports

4K, 5K, and 6K Thunderbolt 3 monitors require a GPU cardwith USB-C output(12)

LG UltraFine 4K and 5K displays

Apple Pro Display XDR 6K

49 5120x1440 Dual QHD monitors using a DP port:

Dell Ultrasharp 49 Curved Monitor U4919DW

LG 49 inch 32:9 UltraWide Dual QHD IPS Curved LED Monitor49WL95C-W

Philips Brilliance 32:9 Superwide Curved LCD Display499P9H/27

Samsung 49 CRG9 Dual QHD Curved QLED Gaming MonitorLC49RG90SSNXZA

8K displays are compatible with Windows(11), but notcurrently compatible with macOS



Part Number


GPU-750W-TB3 (eGPU Breakaway Box 750)

GPU-750EX-TB3 (eGPU Breakaway Box 750ex)




Form Factor


Desktop Thunderbolt 3 to PCIe card expansion system

External Connectors


Part No. GPU-750W-TB3

One Thunderbolt 3 port

Power (C14-type)

Part No. GPU-750WEX-TB3

One Thunderbolt 3 port

Power (C14-type)

Four USB Type A

One RJ45

Internal Connectors


Two 8-pin (6+2 pin) power connectors

Expansion Slot


One x16 mechanical (x4 electrical, Thunderbolt 3 spec) PCIe3.0

PCIe Card Supported


One full-length, full-height, double-width PCIe card

Power Supply


Universal 750W, 100-240V AC, 50-60 Hz

Supports cards requiring up to 375W of continuous power plusan additional 100W peak power

Power Delivery


GPU-750-TB3 provides laptop charging up to 100W

GPU-750EX-TB3 provides laptop charging up to 85W

Eco-Friendly Power Management


See video for description

Standy Power(9)


Consumes 8.5W (sleep) / 14W (idle)

Operating Temperatures


0C to 35C (32F to 95F)

Dimensions (WxDxH)


7.25 x 13.38 x 8 in. (18.5 x 34.0 x 20.2 cm)



7.1 lbs (3.2 kg)



RoHS 3 (Directive 2015/863)

IEC62368-1 and IEC62368-2

Package Contents


Part Number GPU-750W-TB3

eGPU Breakaway Box 750 enclosure

Power cord

0.7-meter Thunderbolt 3 (40Gbps, 100W) cable


Part Number GPU-750WEX-TB3

eGPU Breakaway Box 750ex enclosure

Power cord

0.7-meter Thunderbolt 3 (40Gbps, 100W) cable


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