Sonnet eGFX Breakaway Box 350 (One 300W FHFD x16 Graphics card slot)


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Desktop Thunderbolt 3 expansion system for One full-length, full-height, double-width PCIe card

eGFX Breakaway Box 350

  • 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

Key Features

  • Connects High Performance GPU Cards to Computers with Thunderbolt 3 Ports—Connects a supported GPU card to your eGFX-compatible computer with Thunderbolt 3 ports
  • Supports Cards With Popular GPU Chipsets—Includes AMD Radeon R9 and RX and NVIDIA GeForce GTX 7, 9 and 10 series
  • x16 PCI Express 3.0 slot—Supports up to full-length, full-height, single- or double-width card
  • Supports Other Thunderbolt™ 3 Compatible PCIe Cards—Perfect for full-length cards such as the RED ROCKET-X or AVID Pro Tools|HDX(4)
  • 40Gbps Thunderbolt 3 Interface with One Thunderbolt 3 (USB-C) Port—Ensures full 2750 MB/s of PCIe bandwidth(1) is dedicated to the installed card
  • Choice of Models—eGFX Breakaway Box supports up to 300W card and delivers 15W of upstream power; 550 model supports up to 375W card and delivers up to 87W upstream power to charge your computer; Developer Edition (included as part of the Apple External Graphics Development Kit, not sold separately) supports up to 225W card and delivers up to 60W of upstream power.
  • Quietest eGFX System Available—Large built-in, variable-speed, temperature-controlled fan quietly and effectively cools the installed card
  • Thunderbolt Certified for Mac & Windows


  • Form Factor: Desktop Thunderbolt 3 to PCIe card expansion system
  • External Connectors:
    • One Thunderbolt 3 (USB-C)
    • 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 Water Block Coolers
  • Input Power
    • Universal 110-240V AC, 50-60 Hz
  • 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)
  • 0.5-meter Thunderbolt 3 (40Gbps) cable included

Note: PCIe cards sold separately

AMD GPU Cards Supported

  • AMD Radeon RX 580
  • AMD Radeon RX 570
  • AMD Radeon RX 560
  • AMD Radeon RX 550
  • AMD Radeon RX 480
  • AMD Radeon RX 470
  • AMD Radeon RX 460
  • AMD Radeon R9 Fury
  • AMD Radeon R9 Nano
  • AMD Radeon R9 300 Series
  • AMD Radeon R9 290X
  • AMD Radeon R9 290
  • AMD Radeon R9 285

NVIDIA GPU Cards Supported

  • 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 Titan X
  • NVIDIA GeForce GTX 980 Ti
  • NVIDIA GeForce GTX 980
  • NVIDIA GeForce GTX 970
  • NVIDIA GeForce GTX 960
  • NVIDIA GeForce GTX 950
  • NVIDIA GeForce GTX 750 Ti
  • NVIDIA GeForce GTX 750

Click here for full Graphics Cards Power Compatibility list. Future cards listed as they become available.

Click here for other PCIe Card Thunderbolt Compatibility list as specified by card manufacturers.

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