Which driver for AMD R9 380 Video card?

[Guest]

I just got a new R9 380 video card and I'm having troubles choosing a driver. The Xorg driver appears to be stable, but somewhat lacking (very slow, won't turn off my monitor when idle, and I can't find a way to configure multiple monitors with it). The proprietary AMD driver fixes all of these problems but when I use it, Plasma crashes frequently, forcing me to turn the computer off and back on several times a day. Am I missing something with either driver that would make one or the other more usable?

[otisklt]

My suggestion would be to go with 14.04 as my system runs well with the proprietary AMD drivers... and plasma 4 is solid. Not so sure the same can be said for plasma 5...

I have 2 - 7870's in crossfire

[claydoh]

A brief investigation on the R9 380 gpu seems to indicate poor Linux support in general, at the moment.

If you haven't yet, do try upgrading plasma with the kubuntu-backports ppa, which may reduce or eliminate plasma crashies.
I am sure that there are plenty of tweaks to try with a custom xorg.conf config, but I would not know where to start anymore, it has been some time since I have had to wrestle with AMD graphics