The core temps and the temperature as a whole is the same thing except that the cores are used in the package average. So if you have 4 cores and the temps are 40/42/42/41 then the package temp would most likely display 41 since the average is 41.25. If you have a core that is spread hotter than a few degrees C when doing stress testing then I would take a look at your thermal paste and cooler contact plate to make sure that the CPU is being cooled well.
As for what is acceptable vs what is safe, I use a corsair h110i gtx so I expect it to work as well as a heavy duty air cooler. Nobody can give you a number without knowing if what your cooler is and if you are overclocking. I overclocked my i7-6700k to 4.4GHz and it gets no hotter...
The core temps and the temperature as a whole is the same thing except that the cores are used in the package average. So if you have 4 cores and the temps are 40/42/42/41 then the package temp would most likely display 41 since the average is 41.25. If you have a core that is spread hotter than a few degrees C when doing stress testing then I would take a look at your thermal paste and cooler contact plate to make sure that the CPU is being cooled well.
As for what is acceptable vs what is safe, I use a corsair h110i gtx so I expect it to work as well as a heavy duty air cooler. Nobody can give you a number without knowing if what your cooler is and if you are overclocking. I overclocked my i7-6700k to 4.4GHz and it gets no hotter than 60C while using Prime 95 as a test.
The core temps and the temperature as a whole is the same thing except that the cores are used in the package average. So if you have 4 cores and the temps are 40/42/42/41 then the package temp would most likely display 41 since the average is 41.25. If you have a core that is spread hotter than a few degrees C when doing stress testing then I would take a look at your thermal paste and cooler contact plate to make sure that the CPU is being cooled well.
As for what is acceptable vs what is safe, I use a corsair h110i gtx so I expect it to work as well as a heavy duty air cooler. Nobody can give you a number without knowing if what your cooler is and if you are overclocking. I overclocked my i7-6700k to 4.4GHz and it gets no hotter than 60C while using Prime 95 as a test.
Like I say before, just want to know what people feel comfortable with, not safe (I know what's safe).