Now I have bitten the bullet and bought a EVGA GTX 980 SC. Although costs about 200 euros more, but one has more power and at least the full 4 GB of VRAM. In addition, at EVGA currently there an action in the 5-year warranty from the manufacturer one gets for nothing. All this has convinced me and have this card now installed. Super happy!
In summary: Amazon as always 5 star! Nvidia because of cheating max. 1 Star.