Dell Alienware 17 R2 (Early 2015) - Manual (Page 9)

Specifications
Views
System
Information
Memory
Ports and
Connectors
Dimensions and
Weight
Computer
Environment
Storage
Touchpad Power Adapter Camera
Communications
Battery
Video Audio
Display Keyboard
Media-Card
Reader
Memory
Slot Two SODIMM slots
Type DDR3L
Speed 1600 MHz
Configurations supported 8 GB, 12 GB, and 16 GB