It's hard to say for sure.
My take on it is similar to what the Pentium is going through: because of the new .13micron process, 1.8V is about the maximum safe voltage that one can apply. People at OC are discussing this now. It seems that the throttling in the pentium, which keeps it from burning itself up, has the side effect of not preventing overvoltages to damage the CPU.
For AMD, there is no internal throttling, and any protection circuit needs to be on the mobo, as it reads the new Athlon's internal diode (and immediately shut down, on an overheat). So our AMDs don't suffer from the same problem that the Pentiums do, but they don't loose any data.
For us AMD'ers, it comes down to a balance between keeping the CPU cool, by any means necessary, and applying power. Overall, 95+ degC will fry an Athlon, and anything above 65C, can significantly reduce the lifespan. 45C however is a very comfortable temp for the Athlon, for operation and longevity.
So if you can keep your temps around 45C, then I think that you'll find that the max voltage that you'll be applying will be very near 2.00 V.
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