While the AM4 interface is AMD extended to the Zen3 architecture, there are still limitations on motherboard compatibility due to power supply, pin definition, etc.
According to AMD's official statement, the b550 motherboard recently launched supports zen2 architecture and zen3 architecture processor, and is not downward compatible.
However, foreign enthusiasts found that Asustek's TUF Gaming B550M-Plus motherboard actually successfully lit up the dragon 3400G (code Picasso), Ruilong 5 2600X processors (code Pinnacle Ridge), all built on Zen architecture.
The BIOS version of the motherboard is reported to be 0608(June 15,2020), when compatibility with Zen was not mentioned in the official update log.
Of course, from a complete point of view, it is not recommended that you try this, and consumers willing to pay for the X550 / x570 motherboard, I'm afraid most tend to buy the new processor.
At present, in the domestic market, the price of b550 main board is about 700-1200 yuan.
The picture is a screenshot of CPU-Z, the same below
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