G.SKILL 4GB 204-Pin DDR3 SO-DIMM DDR3 1333 (PC3 10666) Laptop Memory Model F3-1333C9S-4GSA Cas Latency: 9 Timing: 9-9-9-24 Voltage: 1.5V Buffered/Registered: Unbuffered Features: Designed for 3rd & 4th Gen Intel core processors 100% tested to ensure maximum compatibility with laptops & small form factor PCs