Question Can't find the 4g decoding option in my BIOS ?

Jan 4, 2022
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Hi,

I bought Asus prime X570-PRO ATX and AMD Ryzen 5 PRO 3350G with Radeon Vega Graphics yesterday,
and tried to find a 4g decoding option on bios.
I have already tried to update the BIOS, and search in CSM.
Should I buy a new MB, a new CPU, or both?

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Would appreciate the help, thanks in advance.