As far as I've seen from reviews... the general consensus is that this stuff is just a little bit better than useless...
It can also raise case temps slightly.
Both. The two work in totally different ways, one by dampening vibrations and to a lesser extent serving as a "barrier" to the noise (Dynamat) and one by absorbing noise (Paxmate). There's no reason you can't apply Dynamat and then apply a layer of Paxmate on top of it.
Of course if you want the best solution possible, I've heard this stuff is the best noise dampening material available:
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