dual problem

Hello, i have just bought a Corsair Vengeance Model: cmz16gx3m4a1600c9, it's a 4x4 individual ram, i have another 3 Corsair Vengeances model: cmz8gx3m2a1600c9. i have 4 ram sticks, all ram are 1600mhz, same speed, same timing, same everything but this new one is a 4x4. My problem is it's not...