Well this is a hard question to answer, but, the most important and only question is what type of motherboard you have?
There are Dual channel, Quad channel motherboard as well as single channel (the very old ones).
Now, you obviously have a motherboard with DDR4 memory support, then there are two possibility's for that:
Dual or Quad channel.
Can You tell us exactly what motherboard and model?
When it comes to memory's there are a few things to keep in mind:
1. Always install memory sticks from one memory kit. They are matched together.
2. Always make sure that the chosen memory's is indeed supported by the motherboard and its processor.
Different types of memory's, different frequencies, timings etc. the memory stick with the lowest speed will always set the speed for the rest of them.
3. Very important that the voltage of the memory are supported by the processor; meaning that a memory stick with to much voltage let say 1.7V when the processor spec. clearly says 1.5V - will damage and shorten the processors life span.
4. Make sure that the height of the memyry modules can fit under the CPU-cooler (if it is not original).
For DDR3 memory: 1.5 volts, plus or minus 5%
For DDR3L memory: 1.35 volts, plus or minus 5%
For DDR4 memory: 1.2 volts, plus or minus 5%
Use a memory configurator such as Corsair
http://www.corsair.com/en-us/memory-finder
Kingston
http://www.kingston.com/us/memory/search/options
G-Skill
http://www.gskill.com/en/configurator
Etc.
Best regards from Sweden
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