Dell Alienware M11x R3 (Early 2011) - Manual (Page 99)

CHAPTER 7: SPECIFICATIONS
97
System Information
System chipset
Mobile Intel QS67 Express Chipset
SDRAM bus width one or two 64-bit channels of DDR3 memory up to
1333 MHz
Processor address bus width 32 bits
Processor data width 64 bits
BIOS EPROM 32 Mbit
Graphics bus PCIe x16 Gen2
Memory
Connectors
two internally-accessible DDR3 SODIMM sockets
Capacities 1 GB, 2 GB, 4 GB, and 8 GB
Memory type up to 1333 MHz, unbuffered non-ECC, dual-channel
DDR3 configuration
Memory configurations
supported 2 GB, 3 GB, 4 GB, 8 GB, and 16 GB