Specifications of the Motherboard Processors Supported AMD RyzenTM 5000 Series, Ryzen^ 5000 G-Series, Ryzen^ 4000 G-Series, and RyzenTM 3000 and RyzenTM 3000 G-Series Processors are supported by AMD Socket AM4. Chipset AMD AM4 Memory Type DDR4 Memory Slots AMD B550 Socket 4 Memory Bus Speed Maximum Memory 128GB Memory Up to 128 GB of system memory (32 GB for a single DIMM) can be supported by 4 x DDR4 DIMM sockets. Support for DDR4 4733(O.C.) / 4600(O.C.) / 4400(O.C.) / 4266(O.C.) / 4133(O.C.) / 4000(O.C.) / 3866(O.C.) / 3733(O.C.) / 3600(O.C.) / 3466(O.C) / 3400(O.C.) / 3200 / 2933 / 2667 / 2400 / 2133 MHz memory modules Memory architecture with two channels * ECC Un-buffered DIMM 1Rx8/2Rx8 memory modules are supported. CPU support for ECC memory (ECC mode) varies. Support for DIMM 1Rx8/2Rx8/1Rx16 non-ECC Un-buffered memory modules Support for memory modules with the Extreme Memory Profile (XMP) No Port Support for Multiple GPUs