ASRock B450 Pro4 User Manual - Page 28
Installing Memory Modules (DIMM), DDR4 UDIMM Maximum Frequency Support
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B450 Pro4 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. DDR4 UDIMM Maximum Frequency Support Ryzen Series CPUs (Pinnacle Ridge): UDIMM Memory Slot A1 A2 B1 B2 - SR - - - DR - - - SR - SR - DR - DR SR SR SR SR SR/DR DR SR/DR DR Frequency (Mhz) 2667 2400 2667 2400 2133 1866 Ryzen Series CPUs (Summit Ridge): UDIMM Memory Slot A1 A2 B1 B2 Frequency (Mhz) - SR - - 2667 - DR - - 2667 - SR - SR 2667 - DR - DR 2400-2667 SR SR SR SR 2133-2400 SR/DR DR SR/DR DR 1866-2133 23 English
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