I've never personally used DynaMat on a PC but I have helped install it in a car. Not sure what differences there are between their material meant for computers and the material meant for cars, but I can say that the car material would be unlikely to have a large impact on the internal temperature of the case. The material seemed like it would be a fairly good conductor, so I don't imagine it would have any more impact than the difference between a steel case and an aluminum case.
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