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Originally Posted by andy497
I'm not sure what low pressure side working pressure would be, but I seem to recall that keeping C02 liquid around room temperature requires something like 500-700 psi at the very minimum. Those 12 gram bb gun cartridges are 1800 psi. I would guess that the strongest case would be quickly destroyed by 1 psi or so (even that would be hundreds of pounds on a side panel), so this might be a little further than you'd think.
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The CO2 would never be liquid in the case, as it would have been vaporized into a gas by deposition on the heat source (CPU core).
I do not think the vaporized gas would be warmer than 5C though, which would be a problem for certian components as alluded to by maxSaleen. Another issue would be the copper pipes necessary to carry the Co2 liquid to the heat source. It would be hard to re-align them depending on the motherboard and processor.
What I was thinking with those cartridges was that since the case would be hermetically sealed basically, it doesn't naturally adjust to the ambient pressure. You could use the cartridges modify the case's internal pressure to match the local ambient, that's all.