The Tiergrade USB-C Dock offers incredible value for money. It works with my Alienware M17xR4 with the Alienware Graphics Amplifier attached. It dissipates heat very well and is very well made. Its metal body acts as a heatsink, eliminating the need for a fan that can fail or cause more noise. I'm still trying to figure out which of the three graphics cards this unit is using but it should be using the ones in AGA, since the internal GeForce 1070 is disabled it could be the Intel usage that laptops with built in monitors will run but it won't and I have 3 monitors and a VR headset already connected to a GeForce 1080 Ti on AGA. I didn't buy this for graphics but would like to see exactly how it performs on this system and if there are any slowdowns at all. It will take me a long time to figure all this out. I'll update it, as will I if there's interest. The transfer speeds are incredible and there are plenty of connections and added value everywhere. To be honest I didn't expect it to work with Alienware and AGA since AGA works like it's own docking station, but it works great. My only issue, and I'll be contacting them about it, is that the two front USB ports look upside down and it's difficult to use my security keys in them. It doesn't matter with regular cables, but they do have a button that you have to press that's hard to reach. It also comes with a good USB-C to USB-C cable to connect it. I am very happy with this Tiergrade Dock and look forward to using it more often in the future. I'll update this as I have an answer for reversed ports and what graphics card is being used when connecting.
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