It's the Dark Souls of tolerance.
Yeah, I might just play through Transference and Rayman Legends, which I still don't own. Considering one of the Far Crys, but not sure I have it in me to play another big-ass open-world game for a bit.
Far Cry 3 isn't enormous. I think I did every outpost and all the main missions in about 25 hours, so it's likely beatable in much less time than that.
Thank you!
I have not properly followed the procedure because it is intimidating to remove so many screws (and thermal paste is mentioned in the video below).
However, I have done my best to remove the dust hidden in there... and it seems that it has worked.
From now on, I will monitor the GPU temperature with MSI Afterburner.
While The Witcher 3 was running, the temperature seemed to be capped at ~70°C (max over a play session was 73°C), which seems normal.
I don't have a point of reference because I was not monitoring the temperature previously. The GPU ventilator is way less noisy, so I suspect cleaning helped a lot.
I watched that video and I can say that I didn't have to do all the steps Linus did there; mainly, on the GPU I had (a GTX580, blower style cooler), I could un-screw some screws on the bottom and the plastic shroud would just come off the top (with the heat sink and fan still attached to the actual GPU). That made it very easy to clean, with no need to separate anything and no need to re-apply thermal paste when putting it back together.
I imagine it's different for every card, though I wouldn't be surprised if you put "clean <model of GPU you own>" into Youtube and found a video of someone doing it there to give you a good idea of how far you'd have to go.
Anyway, I hope things are stable for you going forward. Troubleshooting PC stuff can be such a pain.