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GearBox Thunderbolt™ 3 eGFX Solution

SAPPHIRE GearBox Thunderbolt™ 3 eGFX Solution

The SAPPHIRE GearBox Thunderbolt™ 3 External PCI-Express enclosure boosts the performance and future proofs laptops and Mini PCs by upgrading the GPU capability and other PCI-Express devices. It features a lightning quick 40Gbps Thunderbolt™ 3 (USB-C) connecting interface that handles various types of data as well as charge a Thunderbolt™ 3 configured laptop.


Installation Guide

This guide describes the installation procedure and includes other important information about the SAPPHIRE GearBox.
Version 1.0
File Size 1.0MB
Release Date 1/23/2017

Compatible Card & Systems List

This document contains a list of the Graphics cards and systems that are compatible with your SAPPHIRE GearBox.
Version 1.1
File Size 214KB
Release Date 6/10/2019

Thunderbolt™ 3: The USB-C that does it all

Thunderbolt™ 3 is the most advanced connecting interface through USB-C, that does it all. Thunderbolt ™3 delivers more speed with a 40 Gbps connection, improved performance with dual 4K Displays and additional features with a single connecting interface.

More Speed - 40Gbps Thunderbolt™ 3

  • Bi-directional, dual-protocal ( PCI Express and DisplayPort )
  • Four lanes of PCI Express Gen 3
  • Eight lanes of DisplayPort 1.2 (HBR2 and MST) - Support two 4K Displays (4096 x 2160 30bpp @60Hz)
  • Native USB 3.1 (10Gbps) - Compatible with existing USB devices and cables
  • Native DisplayPort 1.2 - Compatible with existing DisplayPort displays, devices and cables

Boost Gaming Performance

Simple plug and play to immediately upgrades the Laptop and Mini PC performance.

The SAPPHIRE GearBox provides a seamless way to upgrade your computer’s performance. Simply plug and play to boost the Laptop and Mini PCs’

*Notebook / MiniPC requires a Thunderbolt ™ 3 output interface

Are You Ready To Travel Light And Game Heavy?

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Evolve to Expert Performance


Being even-handed, the Sapphire GearBox does exactly what it says on the tin, with the minimum of fuss, and succeeds in its remit of enabling a number of IGP-only Ultrabooks/MacBooks to play games that are way out of the reach of the baked-in graphics. It also offers Gigabit Ethernet, multi-monitor capability and USB peripheral/storage support for an easy, single-cable transition between mobile and desktop environments. And it doesn't hurt that it looks good and is priced attractively, too.

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KitGuru says: If you want to go down the external GPU route, Sapphire’s GearBox is a great all-round option. A couple of things could be tweaked for the next iteration, but for £274.99 this is probably the best value eGPU solution on the market right now.

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If you have to choose between gaming on integrated graphics or a hobbled add-in card via Thunderbolt 3, the GearBox looks like an all-star. Just be aware that the reality of its implementation means you’re going to leave a lot of rendering horsepower on the table in exchange for a convenient external connection. And at $259, you’re paying a premium on top of the cost of your add-in board. The alternatives don’t look much better, though. Enthusiasts willing to accept the frame rate hit can expect their best value from an external graphics enclosure like Sapphire’s GearBox.

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SAPPHIRE GearBox Thunderbolt™ 3 eGFX Solution Specifications


GearBox Thunderbolt™ 3 eGFX Solution

Connect to PC

Thunderbolt™ 3 using 40Gbps cable

GPU Support (Graphics Cards are not included)

  • GPU Type:
    • Single / Double Slot, Full Length, PCI-Express x16 Graphics Cards
  • GPU Max. Dimension:
    • 266 mm (L) x 125 mm (H) / 10.5" (L) x 4.9" (H)
  • GPU Max. Power support:
    • 300 Watts
  • Graphics Outputs:
    • Depends on the capabilities of installed graphics card

PCI-Express Bus

PCI-Express x16 Gen 3.0


Thunderbolt™ 3 (USB-C for connection to PC)


  • 2 x USB 3.0
  • Gigabit Ethernet 10/100/1000

Internal Power Supply

500 Watts

Supporting Operating System

Apple macOS High Sierra 10.13.4 and later
Windows 10 64-bit


Graphics cards use varied designs based around a common graphics chip. Please ensure the GPU selected meets all size, power, and additional requirements.

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