You have no items in your shopping cart.

Macfixit Australia - Apple Mac RAM, SSD, iPad & iPhone Accessories

Product was successfully added to your shopping cart.

Sonnet eGPU Breakaway Box 750

More Views

In stock at supplier: Yes

Leaves our warehouse in 6-8 weeks

Shipping cost is $9.90 (flat rate) for any size order.
This product is covered by an Australian Replacement Warranty.
30 Days Money Back Guarantee. Click here for more details.

Product code: GPU-750W-TB3

Be the first to review this product



Upgrade your Thunderbolt 3-equipped notebook's graphical capabilities with the eGPU Breakaway Box 750 from Sonnet.

Your price: $734.99

Always secure shopping.
Corporate, Reseller Or Government Buyer?

Transform Your Thunderbolt Computer Into a Graphics 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 and 750ex 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.


Future-proof Upgrade

With each new generation of GPU cards, users can look forward to a step (or leap) forward in performance. Less predictable is how much power they will require to operate—better performance frequently requires increased power. For eGPU users, power consumption can be a concern. Don’t limit your future card choices—choose a Sonnet eGPU Breakaway Box 750 Equipped with 750W power supplies, these Sonnet chassis easily support the highest power demands of latest GPUs and have plenty of extra power to support GPU cards from generations to come.


No Compromise GPU Card Choice

eGPU Breakaway Box 750 systems are designed specifically to accommodate the most power-hungry double-width GPU cards. They support Thunderbolt-compatible cards(1) with popular GPU chipsets—such as AMD Radeon™ RX series (including VEGA GPUs); and NVIDIA® GeForce® series and TITAN GPUs. Even the latest pro cards—AMD Radeon Pro and NVIDIA Quadro® GPUs—are supported! (Note that macOS® supports only AMD GPU cards in eGPU systems, while Windows® supports AMD and NVIDIA cards.) With a GPU card installed, a Breakaway Box functions as a simple plug-in upgrade to significantly accelerate the demanding needs of your video production workflow.

See the list of supported GPU Cards (PDF)  


4K to 8K Workflows –

Connect Two or More Breakaway Boxes

Many task times on supported applications—such as Adobe® Premiere® Pro, DaVinci Resolve™, and Maxon Cinema 4D™, to name a few—can be cut significantly with one eGPU Breakaway Box connected. But, for computers with multiple Thunderbolt ports, times can be slashed when two, three, or four Breakaway Boxes are employed. Connecting one or more eGPUs can multiply your computer’s graphics processing power, enabling it to handle 4K, 5K, 6K, and 8K workflows more efficiently. Plus, a computer’s onboard discrete GPU also contributes to the aggregate performance.


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.


Coolest & 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. Its single-port 40Gbps Thunderbolt 3 interface ensures the full 2750 MB/s of PCIe bandwidth(2) is dedicated to the installed card.


Graphic-Intensive Gaming Support

There’s no need for you to carry a heavy, loud, and hot-running 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! A Breakaway Box is ideal for empowering graphic-intensive gaming on an Intel® processor-based MacBook Air® or 13-inch MacBook Pro®, Ultrabook™ and other thin/light notebook computers that otherwise would deliver a poor gaming experience. Accelerated graphics can either be displayed on one, two, or more external monitors, or on your notebook’s own display panel(4). Best of all, you can upgrade the GPU card in the Box to keep up with the latest in GPU technology (unlike with gaming laptops).


Key Features


  • Boosts Graphics Performance

Connects a high-performance GPU card to your computer with Thunderbolt 3 ports.


  • Cuts Application Task Times

Enables GPU acceleration to significantly improve editing, rendering, color grading, animation, and special effects performance.


  • 750W Power Supply

Support the power requirements of the latest compatible GPU cards; future-proof design handles higher power requirements of cards to come.


  • Supports Many of the Latest GPU Cards

Includes AMD Radeon VII, RX, RX Vega, Pro W and Pro WX models; and NVIDIA GeForce RTX series, TITAN, and Quadro models.


  • Multi-eGPU Acceleration Support

Connect two, three, or four eGPU Breakaway Boxes to slash task times on supported applications.


  • Supports Non-GPU PCIe Cards

Supports Thunderbolt-compatible full-length, full-height, single- or double-width cards –perfect for pro audio I/O and DSP cards and pro video I/O and transcoding cards.


  • Quietest Configurable eGPU System Available

Large built-in, variable-speed, temperature-controlled fan quietly and effectively cools whatever card you install.


  • Choice of Models

Both models support the same GPU cards, include the same power supply, and provide the same portable computer charging support; the 750ex adds additional connectivity.


  • Single-Port 40Gbps Thunderbolt 3 Interface

Ensures full 2750 MB/s of PCIe bandwidth(2) is dedicated to the installed card. 


  • Thunderbolt Certified

Certified for Thunderbolt for use with Mac® computers.


  • Mac and WIndows Compatible

Compatible with Mac and Windows computers with Thunderbolt 3 ports.


 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 with Thunderbolt Technology
  • One eGPU Breakaway Box (WX9100, for example) supports up to six external 4k monitors @60Hz

  • - Mac with Thunderbolt 3 ports and macOS 10.14.6+ (Mac mini see note 10)

        Additional Features:

  1. Support added for AMD RX 560 and RX 590 AMD GPUs
  2. Accelerate games and applications run on the internal display (or Thunderbolt Display) by selecting the App, selecting “Get Info”, and checking “Prefer External GPU”(4)
  3. Windows 10 support under Parallels Desktop for Mac(5)
  4. Support for two eGPU Breakaway Box eGPUs and up to twelve external 4k monitors @60Hz
  • - Mac with Thunderbolt 3 ports and macOS 10.15.7+

        Additional Features:

  1. 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 or better(6)
  • - External GPUs not supported by Thunderbolt 2 or Thunderbolt equipped Macs(7)
  • - External GPUs not supported on Windows 10 under Boot Camp
  • - Certified with all generation Thunderbolt Macs to support Thunderbolt-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 AMD Radeon 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 card with 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 Monitor 49WL95C-W
  • - Philips Brilliance 32:9 Superwide Curved LCD Display 499P9H/27
  • - Samsung 49” CRG9 Dual QHD Curved QLED Gaming Monitor LC49RG90SSNXZA


  • 8K displays are compatible with Windows(11), but not currently compatible with macOS


Graphics Card Compatibility Chart

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




Part Number

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



  • 2-year


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) PCIe 3.0


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 plus an additional 100W peak power


Power Delivery

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


Standy Power(9)

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


Operating Temperatures

  • 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)



  • 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
  • Documentation
  • Part Number GPU-750WEX-TB3
  • eGPU Breakaway Box 750ex enclosure
  • Power cord
  • 0.7-meter Thunderbolt 3 (40Gbps, 100W) cable
  • Documentation


Support Links


Support Knowledge Base

Drivers, Documentation, FAQs


Product Manual


Step-by-step card installation instructions


External Graphics Setup and Usage Guide (macOS)


External Graphics Setup and Usage Guide (Windows 10)



Technical Notes


  1. eGPU 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 each eGPU Breakaway Box 750 model features a 40Gbps Thunderbolt 3 interface, some computers equipped with Thunderbolt 3use an x2 PCIe lane implementation of Thunderbolt 3 technology that limits PCIe performance to 20Gbps. Full performance also requires the use of the includedThunderbolt 3 (40Gbps) cable, or other Thunderbolt 3 (40Gbps) cables. eGPU Breakaway Box 750ex divides bandwidth between the installedGPU card and connected peripherals when connected peripherals are operating.
  3. A few professional applications (such as DaVinci Resolve or Cinema 4D) have menu options to use the external GPU even if the app is run on the internal monitor. Final Cut Pro requires 10.14.1+ for external GPU acceleration.
  4. Ultimate gaming performance is attained by using a display attached to eGPU.
  5. See Using eGPU with Parallels Desktop for Mac.
  6. Not compatible with VIVE Wireless Adapter.
  7. Neither Apple, nor AMD, nor Sonnet support eGPUs on Thunderbolt 2 or Thunderbolt  Macs. There is a method to support Thunderbolt 2 and Thunderbolt Macs from Purge-Wrangler. Not every Mac is supported. If your Mac has a discrete NVIDIA eGPU, this method will not work. If you have any trouble, our support teams cannot assist you.
  8. Power adapter cable for Avid Pro Tools | HDX card sold separately.
  9. Plus power delivery to laptop, if activated.
  10. Under macOS 10.14.6, a Mac mini is compatible with a Breakaway Box with Vega 56, Vega 64, WX 8200, and WX 9100. A Mac mini with a Breakaway Box with an RX560/570/580/590 must be booted with a monitor connected to the Mac mini’s HDMI port. The monitor may be moved to the GPU after booting. This anomaly is fixed in macOS 10.15.7+.
  11. 8K displays require a GPU card that supports 8K displays.
  • For example, the AMD Radeon Pro W5700 has a USB-C Alt-Mode DisplayPort output.

Additional Information

Colour Black
Type No
Form Factor No
Suitable for No
Model Identifier No
Manufacturer Sonnet
Manufacturer P/N GPU-750W-TB3
Shipping Restriction --Please Select--

Australian Owned Business 

Macfixit Australia is an Australian owned and operated business based in Melbourne, Victoria and we've been operating since 2005.

Fast Flat Rate Shipping on all orders

Shipping cost is $9.90 (flat rate) for any size order. Express Options are available in cart/checkout. All in-stock orders are shipped the same day if received by 10.30 AM (Eastern Time Victoria). Orders received after 11:00 AM are shipped the following business day.

100% Satisfaction Guaranteed 

We fully guarantee all of our products. If for some reason you are not happy with any item you purchase from us you may return it for a refund (see Return Policy). 

We do NOT sell or trade our customer information

Macfixit Australia respects your privacy. We never rent, sell or trade your contact information such as your name, address, phone# or e-mail address.

Convenient and Secure Shopping

All items on this website can be purchased safely online using our secure shopping cart. Security is provided by the best internet commerce technology available. We use Symantec Norton as our SSL (Secure Socket Layer) digital certificate provider, allowing our customers the strongest certificate services available. Our website is also scanned by McAfee Secure daily. Every McAfee SECURE certified site is tested and certified to be free of malware, viruses, phishing attacks.

Customer Reviews Gold Stars gold stars

We are part of the Google Trusted Store program for your security and verification of our service. Check out our Google Trusted Stores Reviews here.

Customer Service 

At Macfixit Australia) we’re 100% committed to serving our customers. We check phone and e-mail messages throughout the day and, in most cases we respond within minutes of receiving them. Please feel free to contact our Customer Service Department with any questions at 03 9329 4343 Mon-Fri, 10am to 5.30pm (Melbourme, Victoria Time), or e-mail us under this link.