At those temperatures and no outside interference you can expect that cpu to outlive most housepets......
As Frag said, 60*C is a good guideline for most chips as a maximum sustained temperature, the chip will withstand higher but then your looking at possible longterm damage
I might be wrong but I read that the memory controller runs hotter than the rest on the core logic on a dual core A64/Opteron/FX. Since there is only one memory controller it might be located closer to Core 1.