Help! I have 16gb installed but only works 8gb.

Sep 24, 2018
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Yesterday i found a 8gb DIMM G.Skill Trident X 2400mhz (F3-2400C10D-16GTX), but I only have one DIMM of the 2x8 kit.
In my PC I have installed 2x4 G.Skill Sniper 1600mhz (F3-128000CL9-4GBSR) and when i put the Trident X on my build, the bios only says 8gb installed, but if i check the ram installed, it appears to be working. In Windows says "16gb Installed (8gb Utilizable)".

I need help to make the Trident X work with Sniper, to get 16gb.

My PC:
Cpu: AMD FX 8120
Ram: 2x4 G.Skill Sniper
Motherboard: Asus M5A99X EVO
Gpu: ASUS R9 390X
Psu: Thermaltake Smart 750w

PD: Sorry for my English.

https://gyazo.com/e739dc0c412bc196455e18e466bdbfcb
https://gyazo.com/627cb94ca4aa9a9108726ff6c91b2276
https://gyazo.com/98ba113ab84d0a5ec954544fa175db0d
 
Sep 24, 2018
2
0
10


In the bios shows as 8gb total installed, but if i check the SPD, appears all DIMMS, same in CPU-Z.