AMD Ryzen 5000 Zen 3 CPUs spotted working on A320 and X370 motherboards

AMD mentioned that Ryzen 5000 processors would only be compatible with A520, B550, X570 motherboards initially, then a few months later in January 2021 the AMD X470 and AMD B450 would get supported. But wait Dave, there's more.

So, motherboards equipped with an AMD 300 Series chipset would /should not be compatible. However, it appears that a number of companies already have BIOS ready for A320 and X370 motherboards , which enables compatibility with AMD Ryzen 5000 desktop CPUs. According to a Chiphell forum member, AMD 300 series motherboards can fully support Ryzen 5000 series processors and one of those motherboards has been shown to be the ASRock A320M-HDV, one of the cheapest on the market.

The motherboard was fitted with a 12-core AMD Ryzen 9 5900X processor along with 16GB of DDR4 memory, it is even compatible with AMD's Ryzen 4000G Renoir APUs. It appears that motherboard manufacturers have BIOSes for the X370 and A320, although they are not expected to implement these anytime soon as AMD has officially stated that Ryzen 5000 desktop CPUs will only be compatible with 400 and 500 series motherboards.

Overclock.net forum member, Brko, has revealed that Gigabyte already has Ryzen 5000 CPUs running on its X370 motherboards. It also appears that the BETA BIOS is included with the existing AGESA 1.1.0.0 code. The motherboard was fully compatible with the Ryzen 5000 CPU but had PCIe Gen 4 disabled.

16MB ROM capacity is a major limiting factor and will eliminate support for other generations, keep that in mind though. 

Gigabyte and ASUS BIOS support for AMD Ryzen 5000 desktop CPUs is now available. Gigabyte offers BETA support on a total of 16 B450 chipset-based motherboards, while ASUS offers BETA support on a total of 16 ROG STRIX, PRIME and TUF Gaming products.