Here is ASRock Support Download page for your Motherboard: ASRock > A320M-HDV R4.0
Hard to say since ASRock has no QVL RAM MEMORY List for Bristol Ridge Processors (A8-9600) only Raven Ridge Processors: ASRock > A320M-HDV R4.0
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Bristol Ridge and Raven Ridge are APUs.
I would open a ASRock Support ticket and ask them if the Raven Ridge QVL List RAM MEMORY will also be compatible with Bristol Ridge Processor. See what they suggest.