- Brand: Sonnet
- Model: eGPU Breakaway Box 750
- UPC: 732311013010
- MPN: GPU-750W-TB3
- 1 x PCIe 3.0 x16 Slot
- 1 x Thunderbolt 3 Port
- Supports 2-Slot Wide, Full Length GPU
- Built-In 750W Power Supply
- 100-Watt Power Delivery
- Mac and Windows Compatible
- Dispatch after 2 days
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Sonnet External GPU Expansion System
Sonnet eGPU Breakaway Box 750
Thunderbolt 3 external PCIe graphics card enclosure for professional GPU acceleration
The eGPU Breakaway Box 750 is built for users who want to add desktop-class GPU power to a compatible Thunderbolt computer. Install a supported full-length, double-width graphics card and connect the enclosure with a single Thunderbolt cable to accelerate creative applications, rendering, color grading, 3D workflows, multi-display setups, and high-performance gaming.
Key Highlights
Built for Add-Your-Own GPU Performance
Designed for compatible Windows and Intel Mac workstations, the Breakaway Box 750 gives slim notebooks, all-in-one PCs, and compact desktops a serious graphics upgrade path without changing the main computer.
Professional Workflow Upgrade
Turn a Thunderbolt Computer Into a Graphics Workstation
Many professional applications depend on GPU acceleration for real-time previews, effects processing, exports, rendering, 3D viewport performance, and multi-monitor output. The Breakaway Box 750 lets you connect a supported desktop or workstation GPU externally, helping reduce workflow bottlenecks on systems limited by integrated or low-power mobile graphics.
Broad GPU Card Support
Supports popular Thunderbolt-compatible GPU card families, including AMD Radeon and Radeon Pro cards, NVIDIA GeForce RTX, TITAN, and Quadro cards on supported Windows systems, plus supported AMD cards on Intel Macs.
Full-Length PCIe Expansion
The internal x16 mechanical PCIe 3.0 slot supports one full-length, full-height, double-width PCIe card, making the enclosure suitable for many graphics cards and other Thunderbolt-compatible PCIe cards.
Use Cases
Designed for GPU-Heavy Workloads
Video Editing
Accelerate timelines, effects, transitions, previews, encoding, and export tasks in GPU-powered editing applications.
Color Grading
Improve performance in grading workflows that rely on GPU compute for nodes, effects, noise reduction, and real-time playback.
3D Rendering
Add workstation graphics power for 3D design, rendering previews, ray tracing workflows, and GPU-accelerated content creation.
Animation and VFX
Boost creative work in animation, compositing, special effects, and high-resolution visual production pipelines.
Gaming Setup
Use a supported external GPU to drive gaming graphics on an external monitor or compatible laptop display workflow.
Pro PCIe Cards
Beyond GPUs, the enclosure can support Thunderbolt-compatible PCIe cards such as pro audio, DSP, video I/O, or transcoding cards.
Power and Card Support
750W Power Supply for Demanding Graphics Cards
The Breakaway Box 750 uses a universal 750W power supply and includes two 8-pin 6+2 auxiliary power connectors. It is designed to support compatible cards requiring up to 375W of continuous power, with additional peak headroom for demanding GPU workloads.
750W Internal PSU
High-capacity power design helps support power-hungry desktop GPU cards inside an external Thunderbolt enclosure.
Two 8-Pin Connectors
Includes two 8-pin 6+2 auxiliary connectors for compatible GPU cards that require external PCIe power.
Double-Width GPU Fit
Supports one full-length, full-height, double-width card, with maximum GPU dimensions up to 312mm x 160mm x 55mm.
Cooling Design
Quiet, Temperature-Controlled Cooling
The enclosure uses an optimized airflow design with a large variable-speed temperature-controlled fan. It quietly cools the installed card during light workloads and automatically adjusts airflow as the card and chassis temperature increase.
For best reliability, keep the side and rear ventilation areas open and do not block the airflow path.
Thunderbolt Performance
Single-Cable Graphics Expansion
Connect the Breakaway Box 750 to a compatible computer using a certified Thunderbolt cable. The single-port Thunderbolt interface provides high-bandwidth PCIe connectivity dedicated to the installed card, while also supporting laptop charging through Thunderbolt Power Delivery.
Simple GPU Installation
Install a supported PCIe graphics card, connect the auxiliary power connectors, close the chassis, and connect the enclosure to a Thunderbolt port on your computer.
External Monitor Ready
Connect displays directly to the installed GPU card output ports to access the best eGPU acceleration experience in compatible creative and gaming workflows.
Model Clarity
Breakaway Box 750 vs 750ex
This HTML description is written for the Sonnet eGPU Breakaway Box 750 model. The 750ex variant is a closely related model that adds USB and Gigabit Ethernet connectivity. The standard 750 focuses on GPU and PCIe expansion through Thunderbolt.
eGPU Breakaway Box 750
- Part number: GPU-750W-TB3
- Thunderbolt 3 to PCIe expansion enclosure
- 750W internal power supply
- One Thunderbolt 3 port
- Power connector only for external I/O
- No built-in USB hub or Ethernet port
eGPU Breakaway Box 750ex
- Part number: GPU-750WEX-TB3
- Same high-power eGPU class
- Adds USB Type-A ports
- Adds RJ45 Gigabit Ethernet
- Useful when extra docking ports are needed
- Different from this standard 750 model
Compatibility Notes
Check Computer, OS, and GPU Support Before Installation
Windows Systems
Compatible Windows computers require a Thunderbolt 5, Thunderbolt 4, or Thunderbolt 3 port and Windows 11 according to Sonnet's current compatibility notes for the 750 series.
Intel Mac eGPU Support
Only Intel Macs support eGPU cards. macOS supports AMD-based eGPU cards, while NVIDIA GPU cards are not supported by current macOS eGPU drivers.
Apple Silicon Note
M series Macs do not support eGPUs, but may use the Breakaway Box with certain Thunderbolt-compatible non-GPU PCIe cards where drivers are available.
Compatibility depends on computer model, Thunderbolt implementation, operating system version, installed GPU model, GPU driver availability, and application support for external GPU acceleration.
Official Product Video
Sonnet Breakaway Box 750 and 750ex Overview
Review Sonnet's product overview video for setup, model positioning, and the difference between the standard 750 and 750ex versions.
Technical Specifications
Sonnet eGPU Breakaway Box 750 Specifications
| Product Name | Sonnet eGPU Breakaway Box 750 |
|---|---|
| Part Number | GPU-750W-TB3 |
| Form Factor | Desktop external GPU and PCIe card expansion system |
| Host Interface | Thunderbolt 3 |
| External Connectors | One Thunderbolt 3 port and one C14-type power input |
| Expansion Slot | One x16 mechanical PCIe 3.0 slot, x4 electrical via Thunderbolt |
| PCIe Card Support | One full-length, full-height, double-width PCIe card |
| Maximum GPU Size | Up to 312mm x 160mm x 55mm |
| Internal Power Connectors | Two 8-pin 6+2 auxiliary power connectors |
| Power Supply | Universal 750W, 100-240V AC, 50-60 Hz |
| GPU Power Support | Cards requiring up to 375W continuous power plus additional 100W peak power |
| Laptop Charging | Thunderbolt Power Delivery up to 85W |
| Cooling | Large variable-speed, temperature-controlled fan |
| Operating Temperature | 0°C to 35°C / 32°F to 95°F |
| Dimensions | 7.25 x 13.38 x 8 in. / 18.5 x 34.0 x 20.2 cm |
| Weight | 7.1 lbs / 3.2 kg |
| Warranty | 2-year product warranty |
| Package Contents | eGPU Breakaway Box 750 enclosure, power cable, Thunderbolt cable, documentation |
FAQ
Frequently Asked Questions
Does the eGPU Breakaway Box 750 include a graphics card?
No. It is an add-your-own-card external GPU enclosure. A compatible GPU card must be purchased and installed separately.
Is this the same as the eGPU Breakaway Box 750ex?
No. The 750ex version adds a built-in USB hub and Gigabit Ethernet port. The standard Breakaway Box 750 focuses on Thunderbolt to PCIe graphics expansion and does not list those extra hub ports as part of the standard 750 model.
Can it work with Windows PCs?
Yes, supported Windows computers with Thunderbolt 5, Thunderbolt 4, or Thunderbolt 3 ports can use the 750 series with Windows 11, subject to GPU driver and system compatibility.
Can it work with Mac computers?
Intel Macs can support eGPU cards when using supported AMD graphics cards and compatible macOS versions. M series Macs do not support eGPU cards, although they may work with certain non-GPU Thunderbolt-compatible PCIe cards.
What GPU size can fit inside?
The 750 series supports cards up to 312mm x 160mm x 55mm, with one full-length, full-height, double-width PCIe card supported.
Can I install or remove a PCIe card while powered on?
No. PCIe cards are not hot-pluggable. Shut down the computer, disconnect the Thunderbolt cable and power cord, and then install or replace the card.
Does Thunderbolt cable quality matter?
Yes. Use a certified Thunderbolt cable for reliable performance. Generic USB-C cables are not the same as Thunderbolt cables and may not work for eGPU use.
