Hello fellow RX480 owner.
I have the same exact problems, however WoW works perfectly for me. OK, not perfectly as nearly all Draenor areas make me drop 35 fps, but that's still not that big of an issue.
But in SW:TOR, I have exactly the same. Artifacts when hovering over skills, bars showing the minimap above and next to it, flashing exp bars. Sometimes loading screens go like my screen just broke or the card has to be RMA'd.
I have tried rerolling drivers, did not work. Only thing that works is setting the AA to Medium or below. That kills every SW:TOR graphic glitches we mentioned. But that's
clearly not a fix. Just temporarily.
Thermaltake TR2 500W Bronze
ASUS M5A97 LE R2.0
AMD FX6300 3,5GHz Black Box
16GB HyperX Blue DDR3 1866MHz
ASUS DUAL RX480 4GB GDDR5
And ofc, Windows 10 Pro 64bit.