Today we have on OCinside.de a review of the Sapphire Gearbox eGPU with Sapphire Pulse Radeon RX 5700 XT. Today we are testing the Sapphire Gearbox, which allows to run fast PCIe graphics cards via Thunderbolt 3 externally on Apple MacBook, Mini-PC or Laptop with Thunderbolt. For this purpose we install a Sapphire Pulse Radeon RX 5700 XT in the Sapphire Gearbox and replace a GTX 970M, for example to breathe new gaming life into an old gaming laptop.