ASUS X99-PRO/USB 3.1 Manuel D’Utilisation

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ASUS X99-PRO/USB 3.1
1-7
Chapter 1
Recommended memory configurations
1.2.4 
System memory
The motherboard comes with eight DDR 4 (Double Data Rate 4) Quad Inline Memory 
Modules (DIMM) slots.
A DDR4 module is notched differently from a DDR, DDR2, or DDR3 module. DO NOT 
install a DDR, DDR2, or DDR3 memory module to the DDR4 slot.