Which RAM slot should I install memory in first on the B550-A Pro?
Always insert the first memory module into the DIMMA2 slot. For dual-channel mode, memory modules must be of the same type, number, and density to ensure system stability. It is recommended to use a more efficient memory cooling system for full DIMM installation or overclocking. (Page 28)
From the official Msi B550-A Pro Motherboard manual, page 28
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