ASRock Z790M PG Lightning/D4 User Manual - Page 18
Installing Memory Modules DIMM
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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. 4. The DIMM only fits in one correct orientation. It will cause permanent damage to the motherboard and the DIMM if you force the DIMM into the slot at incorrect orientation. Recommended Memory Configuration 1 DIMM A1 A2 B1 B2 V 2 DIMMs A1 A2 B1 B2 V V 4 DIMMs A1 A2 B1 B2 V V V V 14