It's fixed!
I replaced the AMD Adrenalin driver utility with the AMD Pro utility: it installs older, more reliable drivers from what I can tell
I also swapped the DP port I use on my GPU >_> might have been that easy a fix in the first place, but I digress
[teep is] an evil genius who will one day kill us all - Choco
teep is a God damn genius - Zodd