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Idk how stray capacitance reacts to temperature. But if it's anything like ceramic capacitors, it should have more capacitance when it's cold, right? So that can't be it.

And what about resistance?

Well, semiconductors have higher resistance when they're cold, and lower when they're hot, right? So that shouldn't help either.

But! the silicon is only a small part of the chip. The rest is wires. Layers upon layers of tiny metal wires. And in metals, resistance increases with temperature.

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