Or is it better if I mix it with Kingston DIMM DDR3 8GB 1600MHz HyperX Fury Red CL10?
Except of the HyperX Fury it seems to have the same "stats".
EDIT:
I've also found
KHX1600C10D3B1/8G 8GB 2Rx8 1G x 64-Bit DDR3-1600 CL10 240-Pin DIMM
It seems to fit in better with my original RAM.