I am not really into nvme, but i 've never read of anyone being able to boot from it. Not in AM3+ at least. So before giving money for new motherboard, first make sure that you can use the nvme as bootable. Cause i don't think you can.
Ryzen 2600 - MSI B450 Gaming Plus - 16GB Corsair 3000Mhz C15 - GTX 1650 Super