RAM 16BG installed only 4GB Available Issue

I recently purchased RAM which is identical to what I currently have. I had 2x(4GB Kingston Hyper X DDR3) I had purchased 2 extra exactly Identical they are

{ KHX 1600C9D3B1RK2/8Gx } for a total of 16GB. My PC would not start when I had installed all 4. So I took the New (bad) ones out and it is fine now. so I tried just putting just 3 in and it shows 12 GB installed but only 4 GB RAM available. I ran the check ram program in windows and it didn't show anything wrong with the RAM.



Note: that when I use all 4 slots my computer has a 50% chance of working/turning on and will still only show 4 GB of RAM when 16 GB is installed. When I try and run the system on just the 2 New sticks alone my PC powers on but nothing comes up on the monitors. At this point I believe the RAM is bad but this is my first time installing new ram and I may just be ignorant. any help with my issue would be much appreciated thank you!



BaseBoard Product GA-970A-UD3 REV 1.2.



I ran crucial system scanner with the three ram sticks in and it shows this (yet they should all be 4gb but they are showing as 2gb?)



MEMORY

Slots: 4 (2 banks of 2)

Max Unbuffered DDR3 SDRAM: 32GB

240-pin DDR3 DIMM Banking: 4 (2 banks of 2)

2GB 4GB 2GB Empty



I ran CPU-Z -ID and this is my system https://valid.x86.fr/4k6ewa



Task Manager - shows only 4gb in use and at the top right says 8 gb unknown Form factor is DIMM



P.S. I have also tried my old (good) RAM on the other slots and it works so I believe that the slots are good as well.