I just recently purchased a NUC (NUC5i7RYH) Installation was pretty much straight forward.
1. Windows 10 Pro (32 bit)
2. Crucial CT2Kit 102464BF1160B 2 X 8 GB DDR3L 1600MT/S PC3-12800 SODIMM 204 Pin
3. Samsung 850 EVO - 250GB - M.2 SATA III Internal SSD *MZ-N5E250BW)
4, Seagate Internal hard disk laptop SSHD (hybrid) 1TB (2.5 / SATA 6GB / s / 5400rpm / 8GBMLC 64MB
The problem: 16GB of memory is installed, but only 2.5GB is usable. The bios shows both memories 8GB / 8GB Total 16GB
Where is the missing memory?
One look at your attached file revealed the issue: "System type 32-bit Operating System"
32bit OS can not address RAM in excess of 4GB (3.6GB to be precise).
Your NUC is a 64bit platform with an x64 (64bit) processor, and for you to take advantage of the full 16GB in your system, you have to install a 64 bit operating system, Windows x64 or Linux x64. No, there's no easy workaround.
Thank you very much hegenious, for the information provided.
To Becketo, as you can see on the answer provided by hegenious, you need a 64 bit OS to be able to use 16GB.
Any questions, please let me know.
I did find a workaround. I had purchased an OEM of Windows 7 Pro (32 bit) and installed it on my NUC.
Then I installed or upgraded to Windows 10 Pro (32 bit).
I had a USB of Windows 10 Pro (64 bit) used on my other computers which are running 64 bit that I downloaded from Microsoft.
I took a leap of faith and decided to re-install on my NUC Windows 10 with the 64 bit. It asked me for a product key, but I just ignored it and hit next.
The OS completed successfully changing the 32 bit to 64 bit. I just thought this might help others.