How much RAM can the MSI B550-A Pro support, and what speeds are compatible?
The B550-A Pro supports up to 128 GB of DDR4 memory across 4 DIMM slots in a dual-channel architecture. It supports JEDEC speeds from 1866 MHz up to 3200 MHz, and up to 4400+ MHz via A-XMP OC MODE. The board supports non-ECC UDIMM and ECC UDIMM (in non-ECC mode) un-buffered memory. (Page 17)
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