b450 asus

I am using Asus Prime B450M-A motherboard with 2 8GB 3200 XPG RAMs. I am upgrading to 4x 8GB 3200 XPG RAMs but the PC is not booting. Could anyone help me with this?

Hello I want to add a second GPU to my Asus TUF GAMING B450 mobo. (GTX 1080 and 1660). Problem is - there are two PCI slots and no space for the second card. So, I need a riser. Which one? How do I know it's the correct one and it won't burn the Mobo? Does Asus TUF GAMING B450 even support 2...