Question Bios only detect half of my RAM

[Wowo95]

I have 16GB RAM (4x4Gb) Corsair Vengeance LPX 2666Mhz.
But Bios only detect half of my ram 8192MB, but CPUZ, and Windows detect 16GB. but in task manager Memory Perfomance only detect 8GB.
anyone can help?

Ooh, and everytime i try to change my speed or voltage my PC is reseting something then back to American Standard screen. And i need to press F1

This happen after i change my GPU from Rx480(died) to GTX 1660.
My full spec :

R5 1600
Asus B350F Strix
Msi GTX 1660 6Gb Ventus Sc
4x4 Corsair Vengance 2666Mhz
Be Quiest Sytem Power 8 500watt

 

[computerjoe314]

Post a picture of what you are seeing in the BIOS, please.

 

[Wowo95]

Post a picture of what you are seeing in the BIOS, please.

Umm how do you insert picture? Sorry im new here.. i need to upload it in some link first ?

 

[computerjoe314]

Umm how do you insert picture? Sorry im new here.. i need to upload it in some link first ?

Yes