Thanks for the reply!
I have been gathering together some old parts to test the GPU in another system, but unfortunately I can't do a proper test as the power supply would have to come too (its the only one powerful enough and with the correct connectors that I have).
I too suspect the...
As an update;
I have tried a fesh installation of only windows and control on another drive which still had the same problems,
I have also discovered that disabling antialiasing in Control changes the glittery pattern (seen in the last screenshot) to a very dark but perfectly even grid of dots...
Specs:
ryzen 5 2600
msi b450 tomahawk max motherboard
sapphire nitro+ rx580
16gb 3000mhz corsair vengeance lpx ram (kit of 2x8)
corsair tx750m psu (750w)
500gb m.2 form factor sata ssd with windows 10 and fedora 32, and 1tb mechanical drive with an ext4 partition and a shared btrfs game library...