mmmm, this is a bit of a sore subject for me.
However!
Right first off.
Don't believe the crap about stability problems, AMD driver in *nix have been fine for that for 6+ years(5870 release time)
Performance!! (Games/OpenGL), well. This cant be hit and miss tbh. It game dependant too, not like the differences in windows is between Nv/AMD.
To give you an idea, All @ 1440p
Borderlands pre-sequal 90 ish fps All max bar NV stuff. AA x8
Bioshock Inf 60 ish all max. AA dont remember
Civ-BE 60 solid all max . Will disable vsync later and edit this post.
Source games fly , L4D2 is well in the hundreds.
Ok looking fine you may think.....
Dying light. 20 ish all low also dropped res to 1080. (This is outside, fine inside
)
See the problem . There is a couple of others, But now we seem to be getting some demanding games this is were AMD are failing.
With Shadows of mordor, Killing floor 2, Batman + a few other heavy games I feel will show AMD's weakness.
To note Unreal engine 4 does not like AMD cards. I still cant run the UT2015 alpha
But If I am honest the majority run fine. What dont help is the lack of comunication from AMD regards drivers/problems. Even asking their rep on here gets silence (Yes am looking at you Matt
)
Now this is AMD's prop driver. The open source driver actually runs well, not on 290xx series mind. Not done a lot with the open source driver so cant comment to much.
I will point out that AMD has released their new AMDGPU driver that will be for the 285/R3xx series and up. No idea if its any good though.
just the steam cross play ones.