I'm still running my Q6600 at 3.6 1.44V, depending on ambients OCCT hits 40-45C...Linpack is pretty extreme.
But...if you complete that succesfully, don't worry about it...call it success. I personally think OCCT is more than stressful enough for my uses. About the hardest thing I do is render HD video for 20 minutes and it's at most taxing 80% or so. Linpack is nuts stressfull..:D