You're going to need one of these cables if you have an eGPU

[Windows Central]

Unless you've got yourself a high-quality gaming one, there's a strong chance that your laptop isn't that great for playing video games. Thankfully, you can change that with external graphics cards, or "eGPUs," which are graphics cards that are hooked up to an enclosure that is connected to your device with a Thunderbolt 3 cable. If you're going to do this though, you're going to need a great, fast cable.
[h=3]Best overall[/h][h=4]Plugable Thunderbolt 3 Cable[/h]Staff pick

This cable offers premium 40 Gigabits per second (Gbps) speed and a balanced length of 2.6 feet, making it the best overall choice.

Full story from the WindowsCentral blog...