I couldn't find my precision screwdriver set (darn kids moving my stuff!) so couldn't dismantle the GPU to check inside but agree - I'm 99% sure the GPU overheating is down to either a build up of dust (you can see the fan on it is very dusty) or needing new thermal paste.
I've ordered some compressed air cans and will give it a good blast to see if that helps.
I've ordered some compressed air cans and will give it a good blast to see if that helps.