HP workstation laptop RAM slot usage question

MarkZBook15G2

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Dec 16, 2015
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Just bought a new HP ZBook 15 G2 quad core - which means it is meant to have 4 RAM slots but I can only see two empty slots. This must mean that the other two slots are not visible. I want to add 16GB RAM. The stock system comes with 2x4GB. Does it matter which slots the biggest RAM goes in?
 
Solution
To answer your question, no it doesn't matter, but I would not risk mixing two different sets of memory with different CAS latencies and timings.