PNY Performance 4GB DDR3 1333MHz (PC3-10666) CL9 Notebook Memory -MN4GSD31333 Memory Type: DDR3 PC Type: Notebook Frequency Speed (JEDEC): 1333MHz (PC3-10666) Latency (CAS): CL9 Voltage: 1.5V XMP Support: No Speed Compatibility: Compatible with 1333MHz, 1066MHz Warranty: Lifetime Warranty