ASUS indicates that its B450 motherboards support Ryzen 3000 without the need to update BIOS
On July 7, 2019, the Ryzen 3000 processors based on the Zen2 @ 7nm architecture. These processors reached the market solely with the X570 chipset that offered support for PCIe 4.0. Since the new ones do not arrive chipset, it seems that ASUS he wanted to take action on the matter. The brand announces that its B450 motherboards are compatible with the Ryzen 3000 without the need for update BIOS.
Many users wonder when the motherboards B550, cheaper for being shorter. Although it has been constantly rumored that they were close to launch or the chipsets were ready, they do not arrive. And we may never see such a chipset on the market.
Updated: ASUS tells us that all B450 motherboards manufactured as of November support Ryzen 3000. They tell us that all B450 motherboards on the market now support Ryzen 3000 without the need to update the BIOS. For older models, keep updating to BIOS. So if you buy a B450 and a Ryzen 3000, it is not necessary to do anything, just click the processor and it will work
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ASUS announces that its B450 motherboards support the Ryzen 3000
Finally, the B450 and even X470 motherboards have remained as 'mid-range' motherboards for the Ryzen 3000. AMD has opted for only launching a chipset to shoehorn the PCIe 4.0 interface of questionable utility. Only three graphics cards and a handful of SSDs (quite expensive) are compatible with this interface.
ASUS strategy to announce that their B450 motherboards from the RoG Strix, Prime and TUF Gaming ranges support the Ryzen 3000 without updating the BIOS is strange. First, because the Ryzen 7 have been on the market for more than 3000 months. And second, they would come to confirm that we will never see the B550 chipset on the market.
All this is quite confusing, since there are questions that remain open and are not clarified. One may be that if we have a Strix B450 motherboard for a year, we can remove our Ryzen 2000 and put a Ryzen 3000 without more. For this reason we have contacted ASUS, to clarify this information and when we have it, we will give it to you.

It has ALWAYS been like this, hasn't it?
I have a Gigabyte B450 Aurus M with Ryzen 5 3600 from the beginning.
That the older ones have to update the BIOS is normal in these cases of long socket compatibility.
Or did I miss something, and is there an unsupported B450?
The strange thing is that PCIe 4 is not in the B550 at first, which would not give them an advantage over the B450 but they are yet to be released.