Question Mix DDR3 Hyperx Savage and Fury. Is OK?

[DeYReX]

Hi guys these are my specs:
IntelCore i5 4460
Gigabyte H97-HD3
RAM Kingston HyperX Savage DDR3 1600 PC3-12800 8GB 2x4GB CL9

So i want to upgrade to 16gb ram so i am looking on buying another 2x4gb hyperx ddr3 ram. I was looking and the hyperx fury (blue ones) are cheaper than the savadge ones ( red) that i have. So can i mix the (Kingston HyperX Fury Blue DDR3 1600 PC3-12800 8GB 2x4GB CL10 ) with my Kingston Savage ones? I think the only difference is the CL9 VS CL10.
I suppose that the best option is to buy another 2x4 hyperx savage and have 4 modules of ram so they are the same and works dual.
Thank you a lot!

 

[rgd1101]

Even with same model of ram, mixing kit sometime work, sometime don't.
slower speed have higher chance of working.

 

[Calvin7]

What you call "best option" has no guarantee to be compatible with existing memory. Memory is guaranteed in the form sold.

 

[DeYReX]

So the guarantee option is to use the ram that goes in the same package like 2x8 gb or 4x4gb etc like the packs that the rams are sold together no?
So if i buy another 2x4gb the same model ... it is possible to dont work with my current RAM?
If it dont work what cand i do then with the new memory? Return it?