vanchann: Also AMD drivers for Mint's 18 X server are
not available, so if you'd like to play games, I suggest to stay with Mint 17.3 for now.
adamhm: Drivers for AMD's GPUs *are* available for Mint 18, it's just that AMD have discontinued & are no longer supporting their proprietary Catalyst drivers (because they weren't very good & kept breaking), so the drivers for AMD GPUs on Mint 18 are the open source ones and the new AMDGPU & AMDGPU-PRO drivers (for GCN 1.2+ GPUs).
The latest open source drivers aren't that bad from what I can gather, and the new AMDGPU/AMDGPU-PRO drivers sound like they're a huge improvement but I can't test them myself as I don't have a GPU that can use them yet.
AMD's proprietary drivers were what I meant too, but it's always better to be more specific. :-)
Open source drivers are fine for 2D applications, but they have never been the recommended approach for 3D games.
I wonder what AMD is expecting.
Instead of fixing their drivers they drop support for *NIX systems. Since they won't support newer versions of the X server the problem will expand to other systems for sure, like BSD and Illumos based distributions.
I don't see the reason why anyone, with interest on *NIX systems would buy an AMD GPU. Even if 3D games are not a field of interest, would anyone like unsupported hardware?