Specifications of the Motherboard Processors Supported AMD RyzenTM 5000 Series, RyzenTM 5000 G-Series, RyzenTM 4000 G-Series, and AMD RyzenTM 3000 and 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 Up to 128 GB of system memory (32 GB per DIMM capacity) can be supported by 4 DDR4 DIMM sockets. Support for DDR4 memory modules: 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 architecture with two channels * Support for 1Rx8/2Rx8 ECC Un-buffered DIMM memory modules CPU-specific support for ECC memory (ECC mode) varies. Support for 1Rx8/2Rx8/1Rx16 non-ECC un-buffered DIMM memory modules Extreme Memory Profile (XMP) memory module compatibility Support for Multiple GPUs with no ports