Well that s*cks, then... Better call the store and pray for some refunds, hehe. I'll test the sticks tomorrow then, too tired now. Also: thanks for the help so far!
P.s. I'll add a few things:
The ram in my pc was not in the list (=motherboard manual) of recomended/compatible RAM. However, I placed the sticks (2) with caution, even used anti static stuff, etc.
Most of the errors were found during test 4 and 6, with a total of ~450k errors during pass1.