Are we talking CPU? GPU? VRM? Generally Intel states that safe operating temperatures should be below about 70-75C degrees. AMD processors tend to run cooler than Intel. AMD states that safe operating temperatures should be about 61C or under. I would assume this is more on the conservative side seeing as its from the manufacture but I would definitely stay under 80 degrees Celsius for Intel and under 70C with AMD. I would consider those temperatures bad for the health of the processor. IMO, keeping your CPU lower than 60-65C would be better for its lifespan.
Graphic Processors run hotter than the CPU will. 90-95C and under is safe operating temperature's for most top end Graphic cards. Unless you are running some really demanding...