Result for the computer: The temperatures dropped significantly! The measured values were all determined in the normal use of the computer. Am not a hardcore gamer ...
HDD: previously always around 40 ° - 45 °, now just 35 ° in maximum.
Graphics card: so far almost 80 °, now only 60 °
Processor: so far around 45 °, to a maximum of 50 °, now only 35 ° at the maximum
And the fan is not heard. Really quiet as a whisper!
Conclusion: If you are not afraid of tinkering, will be rewarded with a cool computer, which along the way by the blue LED lighting also really what hermacht ... ;-)