Thanks for the responses.
Following a tip from the official forums, I deleted the existing Mayron UI WTF, Interface and Cache folders to start from default. The same issue occurred with the crisp textures and high heat.
I then installed the old set of Interface and WTF folders and the textures went back to being smudgy.
Is there a central config file that would show a difference in any background settings?
I'll be checking the drivers when I get back from work, and I'll also be giving it a good clean inside (although it's not that dusty). I'll check the addon usage as well.
Checking the CPU heat, it was running at 75-80 just on the character select screen.
Thanks
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