No, the temp inside the PC didn't rise at all. You have to make sure the flow of air is not restricted by the material. If you end up covering up vents, then your fans will be pushing against each other. I like this stuff a lot. I was looking to put some in my truck to quite down the ride, but after the lining my PC, there wasn't much left. So, I'm looking into dynamat for the auto and using the rest of the Nexus stuff for my server case.