Would this modual go in Late 2012 Mac book Pro and run faster?  I have 2x4GB. can i buy only one 8GB Ram and replace with 1 4GB.

I have 2x4GB. can i buy only one 8GB Ram and replace with 1 4GB.
Or is it possible that 2x4GB and 1x8GB can fit in Late 2012 Mac book Pro

Apple Memory Module 16GB 1867MHz SO-DIMM (2x8GB)

Apple Memory Module 16GB 1867MHz SO-DIMM (2x8GB)

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