In an announcement made by AMD last week said, they would discontinue support for older chipsets with their upcoming Ryzen 4000 series, codenamed Zen 3 so AMD Ryzen 4000 CPUs based on the Zen 3 processor architecture will only be compatible with 500-series AM4 motherboards
“AMD has no plans to introduce ‘Zen 3’ architecture support for older chipsets,” Hallock wrote. “While we wish could enable full support for every processor on every chipset, the flash memory chips that store BIOS settings and support have capacity limitations. Given these limitations, and the unprecedented longevity of the AM4 socket, there will inevitably be a time and place where a transition to free up space is necessary—the AMD 500 Series chipsets are that time.”
When Zen 2 launched, there were some issues caused by BIOS sizes. MSI went ahead and relaunched most of their 400 series lineup with the Max series. The Max boards were identical to the original models in every way with the exception of the BIOS chip, which was upgraded from 16MBto a 32MB capacity, allowing these boards to comfortably support all Zen processors.
AMD Zen 3 processors will be incompatible with 400 series and older motherboards
the AM4 socket was announced alongside the first generation Ryzen processors in 2016. When it was released, AMD had promised to support the AM4 socket until 2020. Users of AMD’s older platforms hoped to be able to upgrade to AMD’s 4th generation Ryzen processors once they arrive.
So what can B450, B350 / X470, X370 users do ?
They can still upgrade to upto and 16 core, 32 Thread AMD Ryzen 9 3950X or a more reasonable AMD Ryzen 9 3900X which is 12-core, 24-Thread and should have a price tag of ~$400 . But if you had a 1st gen Ryzen 3 then even getting a Ryzen 7 2700X can be a significant upgrade
AMD Ryzen 9 3950X 16-Core, 32-Thread 4.7 GHz Max Boost
AMD Ryzen 9 3900X 12-core, 24-Thread 4.6 GHz Max Boost
AMD Ryzen 7 3800X 8-Core, 16-Thread 4.5 GHz Max Boost
AMD Ryzen 7 3700X 8-Core, 16-Thread 4.4 GHz Max Boost
AMD Ryzen 7 2700X 8-Core, 16-Thread 4.3 GHz Max Boost
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