This high-quality thermal pad bridges the gap formed, the heat dissipation is ensured again. It should be noted withdraw both films. Now the temperature levels off at full load at 85 °, regardless of the duration of the test. For a notebook a perfectly normal temperature, especially since the fan revs up ever so slightly.
Fortunately, I have chosen right away the right thickness, which is of course difficult to assess. The thinner the pad, the better the heat dissipation.
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Another tip for significantly better cooling: instead of a thermal pad use a piece of copper with a dollop of thermal paste on each side. My GPU now reaches its maximum at 68 ° under Furmark, probably the fan rotates while even slower. This is not surprising, because in contrast to the thermal conductivity of the Phobya with 7W / mK Copper has a thermal conductivity of no less than ~ 380W / mK!