I totally agree with Mike here. I would also give the same recommendations:
1. The Ryzen 7 3700X is a much better value than the Ryzen 7 3800X
2. You will need a much better motherboard to complement such a high-end CPU. X570 would be preferable but an X470 may work.
3. If this is a gaming build, you might want to go for a Ryzen 5 CPU and get an RTX 2060 Super (or higher) instead. Even then, I would still treat it with a better B450 board than the one you picked. At the very least the B450 Aorus Elite, but preferably something like the B450 Tomahawk or B450-F Strix.
Note: Not all B450 and X470 boards are compatible with 3rd Gen Ryzen out of the box, so be careful when purchasing.
Also, what PSU do you have?