4GB, 240-pin DIMM, DDR3 PC3-12800 memory module Part Number: CT51264BD160B Module Size: 4GB Package: 240-pin DIMM Feature: DDR3 PC3-12800 Specs: DDR3 PC3-12800 • CL=11 • Unbuffered • NON-ECC • DDR3-1600 • 1.35V • 512Meg x 64