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For Ryzen Series CPUs (Picasso and Raven Ridge), ECC is only supported with PRO CPUs.Please refer to below table for AMD non-XMP memory frequency supportA-Series APUs:Ryzen Series CPUs (Matisse):Ryzen Series CPUs (Pinnacle Ridge):Ryzen Series CPUs (Picasso):Ryzen Series CPUs (Summit Ridge):Ryzen Series CPUs (Raven Ridge):SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module labelDR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module labelDue to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows32-bit OS. For Windows64-bit OS with 64-bit CPU, there is no such limitation.