Is this work well together?
Cause i read - Ryzen 9 is PCIe 4.0 but B450M-A PCIe 3.0
This can make the system unbalanced?
This is the VRM for B450M-A. I'd try it with something different that has a good VRM if I were you. VRM may be more important than PCI.
So you suggest upgrade to X570?
I would consider a good motherboard if I were you. So my answer to your question is yes.
There are some very good B450 and B550 boards with good VRMs... it does not have to be a X570... there are even some very bad X570 VRMs...
As like what?
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