Question Dual Channel Causing System Instability and Crashes

[matheusstars1]

Good night all, im having troubles with my ram
VGA : NVIDIA GT 730 2GB (planning to buy an RX 580 8GB)
CPU : AMD Phenom II X6 1100T BE 4.1Ghz Cache 9.7MB HT Link 2.9Ghz CPU-NB 2.9Ghz
Ram : Corsair Vengeance PRO 2x8GB 2133Mhz 11-11-11-27-38-2T
Motherboard : ASUS M5A99FX PRO R2.0 (bios is on the latest version)
PSU : Corsair GS 800 80 Plus Bronze
Cooler : Water Cooler Maelstrom 240T

So, when i put the ram sticks at A1 and the second stick at A2 to make them work at dual channel , the windows just act weird, i always get crashes on the chrome while navigating, or when i try to play some games such like war thunder, gta, it simple just crashes to desktop without any message, sometimes the screen goes black and the pc freezes completely, so i need to reset it, but that dont happen when the ram are running at single channel, when the ram sticks are at A1 and the other one at B1, it goes in single channel and everything works perfectly without any problems, but when i try to run at dual channel, the problem starts, anyone to help me ? sorry for my terrible english, here is my cpu z validation https://valid.x86.fr/3e0nhr

 

[SteveRX4]

What slots does your motherboard manual say they should be put in?

How do you know that in A1 and B1 that it is single channel?