Yes mate, I'm going for B450 with 8gb 3200, the problem is am I suppost to update the bios? that's my issueI'd suggest getting a B450 mobo. The 3400g is a great APU, with the best integrated graphics out there. It wil play 1080p on low-medium settings, depending on the game. The CPU is very capable.
You also should get 3000mhz ram. Ryzen loves fast ram. By having fast ram, and a 2 x 8gb kit, you will have a really good system. All it will need to game would be a discrete GPU, like a GTX1660/RX570/580.
Yes mate, I'm going for B450 with 8gb 3200, the problem is am I suppost to update the bios? that's my issue