ASROCK 90-MXBK10-A0UAYZ, Manual

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Z790 LiveMixer
2.3 Installing Memory Modules (DIMM)
This motherboard provides four 288-pin DDR5 (Double Data Rate 5) DIMM slots,
and supports Dual Channel Memory Technology.
Recommended Memory Configuration
1 DIMM
2 DIMMs
4 DIMMs
A1 A2 B1 B2
V
A1 A2 B1 B2
V V
A1 A2 B1 B2
V V V V
1. For dual channel configuration, you always need to install identical (the same
brand, speed, size and chip-type) DDR5 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 , DDR3 or DDR4 memory module into a
DDR5 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.