What is your ambient?
What is your Vcore as shown in CPU-Z?
Even if your prior Core temperatures were 85c, that's still too hot by 12c.
i7 920 D0 Thermal Specifications as listed in Intel's Processor Spec Finder
Tcase Max (CPU tremp) = 68c
Tjunction (Core temp) = 73c
Note: "Average" or "Mean" Core temperatures are always 5c higher than CPU temperature. The Processor Spec Finder shows CPU temperature, NOT Core temperature, which is a very common misconception among many users. Refer to the link in my signature for more information.
Also, when you run Prime95 Small FFT's, set all fans at 100% RPM with case covers removed.