If you used dry ice the same way as liquid nitrogen (i.e. dump it right over the CPU), then it'll be better than phase change, but only temporary.
Phase change can get your CPU as low as -40 deg C, which isn't quite as good as liquid nitrogen, but still well below the CPUs operating temperature (around the freezing point).
So if you're looking for a one shot run of an extreme overclock, liquid nitrogen is your best bet. If you're looking for a permanent performance boost, (direct) phase change is your solution.
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