Can I operate my new laptop in dual channel mode? 15-n216us

Hi,
I have a new HP touchscreen 15.6" model 15-n216us.  It came equipped with a 4GB memory stick and one open slot.  I purchased an "identical" stick and installed it with no problems.  ("Identical" means same manufacturer - Kingston -, same size, numbers, etc... but they are not "twins" per se.)
I ran CPU-Z before and after the install and both times it showed the laptop running in single channel mode.  I swapped the sticks into opposite slots and ran it again.  Each time it shows 8GB memory running single channel.
So, my question is this.  Is this machine capable of running in dual channel mode?  (And it not, where would I have found this myself?)  If it does, does this mean that I have to buy "twins" ... ie two new paired 4GB sticks?  And lastly, am I really missing much by not running dual channel mode?
Thanks!
-CD

From the Service Manual:
DDR3L-1600-MHz dual channel support
Can we have the two Kingston stock numbers for the memory modules? Generally to run dual channel they do have to be identical and a difference in latency or any other parameter can block dual channel operation. 

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