The effort is worth it.

Who of the English, like me, is not so powerful, which should definitely download the German assembly instructions from the HP of the manufacturer and print. Otherwise, a similar drama like me could play.
I will not go into detail here, but without removing the motherboard mounting the cooler was not possible. Then I also had mounted upside down the sealing rings, so that the cooler despite tight position screws strongly shook. What a drama!
So, second PC thank downloaded German Guide printed and then the installation was managed by a total of 2 hours.

The cooling performance, however compensated every effort. My system:

Case: Antec P280
Motherboard: Asrock 870 Extreme 3
CPU: Phenom 2 X4 955
Graphics card: Sapphire Radeon 6850

Temperature with Coretemp read. Idle 30 degrees under load (Prime95) 40 degrees
The processor then I have overclocked at 1.4V core voltage to 4000 Mhz. The NB 2600 without voltage boost.
After 1 hour under Prime 95 I had a temperature of 51 degrees.

Conclusion:
Pro: Super cooler at an affordable price.
Cons: Fummeliger and nerve-racking for installation opportunity wrench like me.

Nevertheless whopping 5 Stars.