ASRock X370 Pro4 User Manual - Page 27
Installing Memory Modules (DIMM), DDR4 UDIMM Maximum 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. DDR4 UDIMM Maximum Frequency Support A-Series APUs: 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 2400 2400 2400 2133 1866 1866 Ryzen CPUs: 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 SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label 22 English
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