Some systems run all the time. My really new i7 laptop has that latest model of everything and it barely runs at all.
It would be strange for me to think my older laptop should use it's fan as little as the new laptop but I think that is what you did.
Bob
E-System PC Windows Vista.
Fan running constantly so I took the side off and blew it all out. fan still running constantly even with the side off.
I'm thinking heatsink/thermal paste could there be other reasons? How hard is it to replace thermal paste?

Chowhound
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