After the problem-free installation of memory was recognized immediately and you could use it immediately. The boot process has instead of 45 s 39 s only lasts.
(The Windows 7 Experience Index of RAM now stands at 4.6 instead of previously 4.5.)
In normal operation with office software and Internet a difference will hardly be noticeable. Only when memory-intensive programs are used, an improvement is quite noticeable.
As can be seen already on Windows 7 Experience Index, the "Memory operations per second" only slightly different. It is rather the now twice as large memory, which affects the performance because Windows no longer has so often access the slow hard drive.
PS: The guarantee is not a lifetime for D, A and CH. According to the description on the back of the package it is for the 3 countries "only" 10 years.