This is a case of reality vs the Intel spec.
Intel spec is indeed 67.9C, but in the real world, with a FULLY loaded CPU (running 8 threads), then anything under 80C is acceptable. It is really rare that a CPU is continuously in a fully loaded condition. Best programs I have found to heat them up is IntelBurnTest http://majorgeeks.com/IntelBurnTest_d5987.html
and OCCT 3.1 http://www.techspot.com/downloads/4665-overclock-checking-tool.html
OCCT is nice as it also stresses the GPU (like Furmark) and the CPU at the same time so you can see how much heat a worst case scenario builds. Also stresses your power supply as well. I usually get higher temps (77C max, i7 firstname.lastname@example.org) with IntelBurnTest vs OCCT.
Long story short, Modern Intel CPU ~80C is safe. Most modern GPUs~90C is upper limit.
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