I'll get a 3rd generation ryzen soon, but I've heard that an A320 motherboard won't support these processors.
Used this AMD official reply concerning PCIe 4.0 lanes but also mentions about 3rd Generation AMD Processors: The Industry Leading AMD AM4 X570 Chipset
Best to open a Support Ticket with your manufacturer's Motherboard and asked them if they will create a new BIOS version to support 3rd Generation processors.
If not, you will probably find out once the actual 3rd generation processors goes public for sale. At which time is when any new BIOS will come out to support it if it will by the motherboard's manufacturer.
kingfish just gave a better answer in his new thread at General Discussions concerning the A320 and Ryzen 3xxx Processors: AMD’s X570 Chipset Isn’t Fully Backwards Compatible, A320 Won’t Support Ryzen 3000
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