ASRock B450M Pro4 R2.0 User Manual - Page 28
Installing Memory Modules (DIMM), AMD non-XMP Memory Frequency Support
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2.3 Installing Memory Modules (DIMM) This motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots, and supports Dual Channel Memory Technology. 1. For dual channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR4 DIMM pairs. 2. It is unable to activate Dual Channel Memory Technology with only one or three memory module installed. 3. It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4 slot; otherwise, this motherboard and DIMM may be damaged. AMD non-XMP Memory Frequency Support Ryzen Series CPUs (Matisse): UDIMM Memory Slot A1 A2 B1 B2 Frequency (Mhz) - SR - - - DR - - - SR - SR - DR - DR SR SR SR SR SR/DR DR SR/DR DR SR/DR SR/DR SR/DR SR/DR 3200 3200 3200 3200 2933 2667 2667 English 22