This would probably depend on the voltage marked on the chip. Personally I wouldn't want to chance more than a 20% increase. If it's a 1.5 celeron, I wouldn't go past 1.8. Again, however, this may depend greatly on the core temperature induced.
The truest temp is usually found in the bios if your board has this feature.
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Cosine, secant, tangent, sine,
3.14159.... Cheer at M.I.T.
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