Hi, I have a 3 year old desktop, 6700K overclocked, cooled with Noctua NH D15 (the double fan monster)
When I first had it, when maxed out temps would be only 70 degrees
Now it's going above 80 degrees ...
I am thinking of reapplying thermal paste.
I don't think dust is a problem, I have cleaned the dust from everywhere (case is a Fractal R5 which has anti dust mechanism too so very little dust gets in, vents are cleaned)
Reminds me now to check the case fans are working ...