AppleInsider takes an in-depth look at Apple and Blackmagic's Thunderbolt-enabled eGPU, testing the MacBook-accelerating hardware with a gamut of tests from 5K gaming to video editing. We show you everything that sets this eGPU apart from the pack.

The Blackmagic eGPU, built in cooperation with Apple, might seem pricey at $699, but it comes packing a Radeon Pro 580 GPU, the same chip that comes in the top-spec 2017 5K iMac. By itself, the silicon is worth just under $300, and you can now get it bundled with some other eGPU's for around $500.

So why would anyone want to pay extra for this particular unit from Blackmagic and Apple?