The memory works so far properly and will also be displayed with 400/800 Mhz.
For Windows 7 Professional 64 bit and 4 GB can be used.
The Windows 7 Experience Index gives a rating of 6.0.
For me it is not clear that this is to mark memory. The original manufacturer sticker was removed and replaced by a "Komputerbay" sticker.
Nevertheless, everything runs smoothly and there are no problems surfaced.