AMD ultimately wanted the 500-series chipsets, the B550/X570, to be a launchpad for the future Ryzen processors.Most AMD motherboards are outfitted with 128 megabit (16 megabyte) BIOS chips. B550, the follow-up to the B450, will not support previous generations of Ryzen processors — … The AMD B450 chipset has the ability to overclock both memory and the CPU without artificial limitations getting in the way. until we see Zen 3, so they do have a lot of time to try things and to test things.There might be a situation where moving up to the beta BIOS fork will make the system unable to downgrade. The new AMD B450 chipset will support almost the entire range of AMD’s processors, including the Athlon Processor, the 7th-gen AMD A-Series APU, and both the 1st-gen and 2nd-gen AMD CPUs and APUs. The AMD B550 chipset is an upgrade of the B450 chipset from 18 months ago, introducing three key features : PCI Express 4.0 support for both graphics cards and NVMe storage; Dual GPU support ; PCI Express 3.0 general purpose lanes; This AMD table gives you a good idea of what the B550 chipset offers over the B450, and how it differs from the X570. AMD will be offering continual support to its ODM partners on this, especially those with auto-update software. AMD stated that this might be a possibility, but they haven’t worked on those details at this time.AMD also re-confirmed that we are set to see Zen 3 processors in 2020.AMD came under a lot of fire. So even if a motherboard vendor had a larger BIOS chip, say MSI had a 32 megabyte chip, then it would actually operate like two partitioned BIOSes and it would get very complicated. The fact that there was a discrepancy between what the users expected and what AMD had been saying essentially became a miscommunication or a misunderstanding, but one that had a negative effect on a number of users who were expecting to upgrade the system.As a result AMD initially made the decision that the B450/X470 motherboards would support the Ryzen 1000, Ryzen 2000, and Ryzen 3000 processors, but would not be able to support any more due to this limit. CPUs released after Zen 3 will require a new motherboard, we’re told. In order to make room for the code to support the new processors, the beta BIOS will disable support for many existing AMD Ryzen desktop processors. Zen 3 support on b450 and x470 is a mess (editorial) The complexity of this situation is exactly why AMD decided to shift support for Zen 3 to 500-series chipset motherboards in the first place. Part of this issue stems from an old CPU line not having the growth room, and the believed that pushing support for Zen 3 to the 500-series wouldn’t be that big of an issue. AMD will supply board partners with a beta BIOS for B450 and X470 motherboards that will enable Zen 3 support. In this event, I asked AMD if they would be expanding the Boot Kit program as they did with Ryzen 2000, and lending CPUs to users that needed them to update. See Comparison of ATI Chipsets for the comparison of chipsets sold under the ATI brand for AMD processors, before AMD's acquisition of ATI. CPU Support List . This is what makes it such a tight squeeze.As most motherboards have 16 MB, and the CPUs can only address the first 16 MB of a BIOS chip, then we might see an issue where 400-series motherboards may end up having two ‘forked’ BIOSes – one for ‘up to Ryzen 3000 inclusive’ and one for ‘Ryzen 3000 and beyond’. Each generation of processors require a portion of the BIOS space for compatibility code – normally if you can support one processor from a generation, then you can support them all. To cut a long story short, the TL;DR mantra from AMD is:They are acknowledging that they perhaps misread the situation from its user base.