I have 2-years old gigabyte r9 280oc. I can't remember when it started or it was there always, but my screen flickers or rather it is moving fast up and down a little bit.
Occurs in desktop and games as well (I presume it is gpu clock going low/high), but it looks like kind of screen adjustment, doesn't make much trouble but still it's there.
Is this known to you guys? is this a driver issue or what? I think I remember this since few driver updates, I have no thermal problems etc, everything works fine. I used to work on two screens but it happens independently of their number.