User Guide
ASUS X99-E WS/USB 3.1
1-7
Chapter 1
Recommended memory conīægurations
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.