I'm currently using an old ATI FirePro V4900 to run my 3 displays -
1x 2K and 2x 1920x1200.  I've been seeing glitches in some Gtk
applications for a while now (running on Plasma X11), and I'm getting
pretty tired of them.[1]  This card uses the old radeon driver, so I'm
thinking that it might be time to bite the bullet and move to something
a bit more modern.

I do not do any gaming.  I simply want to be able to run my preferred
desktop (Plasma) with compositing and a few effects turned on.

NVIDIA is out, because of the "just works" requirement, so I'm looking
at AMD options.  Is the RX550 a good choice for my use case?