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NotThamesWater-
What do you mean by the cooler block?
Edit - I just looked up what lapping is, I thought you were using a cool word for "applying thermal paste". I didn't do it cos I didn't know it's a thing, and also cba.
edit 2 - of course that's what lapping is, I remember reading an article about the guys that go around lapping granite engineering surface plates.
Sumo
The other day I took apart my PS4 and replaced the thermal paste on the CPU/GPU. I've been replaying Monster Hunter and right from the opening menu the fan has been on takeoff mode, now it's barely even audible. It's so quiet now that I was worried I'd broken the fan at first. The thermal paste was a sorry state before, but it's a day 1 PS4 so it's done it's job.