I can't believe the rep answered this and never mentioned that the 3400G is actually a 2000 series chip with graphics CU's. With the new 4700G it's a 3000 series chip. APU's on Ryzen just run a Generation behind. There is no reason it shouldn't work with a B450 Board unless something is broken. If you had updated the Bios you'd probably just be S.O.L. since it's a 1 way trip.
Submit photos and a description of your PC to our build showcase
See other custom PC builds and get some ideas for what can be done
Services starting at $149.99