Just so you're aware, this testing is anything but scientific. I was messing around with openSUSE Tumbleweed and the bleeding edge open source AMDGPU drivers. I was truly amazed by the performance of WINE using the Gallium3D version. World of Warcraft was a solid 60fps with v-sync on at Ultra settings. I don't even get this smooth of game play on my main rig with it's GTX 980Ti using the binary driver. I didn't bother testing with v-sync off as I always play with it on. Like I said, not scientific.