Dark coin specific or better yet... Something like a "plug and play"
Meaning yea today you could mine X11 but tomorrow you can cross over to something non-x11. If that even exist.
Let's say I'm running a raspberry pi with some setup that let's me mine x11 but is also super mobile and can switch to do other things say from mining other algos to mining multiple x11 coins at once. ( super imagination I know)
Any off the shelf top of the line graphics card can currently mine x11 or any other algo. The only two algorithms that have become extremely difficult to mine with the former hardware are SHA-256 (Bitcoin) and Scrypt (Litecoin, Dogecoin)