Simple (Well maybe not so simple) Physics comes into play when you cool semi-conductors to low temperatures. Unlike conductors, when semi-conductors are cooled their resistance increases. When you get an average electron energy below the activation level you start "missing" pulses. Because video cards don't produce as much internal heat as CPUS, this problem can become noticable even at temperatures around 0C. If you are getting problems with a code chip you can't explain any other way. This is probably the reason.
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