Safe CPU Temps?

Just curious as to what temp. keeping the CPU below is ideal?

Running a Core i7 2700k OC'd to 4.4. Maximum temp. thus far running prime95 is 69 C with a Coolermaster V6GT.

I just reseated the cooler and am seeing a 12 C difference...obviously, did not do a good job the first time. Nerves.

First time building a computer. Not sure what took me so long to wise up.

Room temp. is 78 F...

Thanks.

keep cpu per core temp below 85c on load(100%, all cores, intel stress test, or prime95)

For extended use, i7s should supposedly be kept under 75C, i5s under 70C, and i3s under 55C.

34c AMD X2 like a boss.