WHY?????? I CAN'T PUT CL7 IN MY MEMOOOOOOOOS

I have 2 kits of G.Skill 2x2GB DDR3-2200 F3-17600CL7D-4GBXHD Black XRipjaws 7-10-10-27@1.65V

When I put X.M.P. it says that will be 7-10-10-27, but puts 8-10-10-27!

And if I put manually 7-10-10-27 the PC don't boot... Is it possible by bad MB? I tried with 4 sticks individually....

ByE!