What CPU model do you have and why are you changing the TJ Max settings in RealTemp?
For the older Core 2 Duo CPUs, users could never agree what the correct value for TJ Max should be because Intel never publicly released this information. What little information that was released concerning TJ Max and Core 2 Duo based CPUs was somewhere between misleading and completely inaccurate.
When the Core i was first introduced, Intel started writing the correct value for TJ Max into each core of each CPU. There is rarely any reason to change the TJ Max value in RealTemp.