Corsair CMSO4GX3M1A1333C9 4GB (1x4GB) DDR3 1333 MHz (PC3 10666) Laptop Memory 1.5V Lifetime Warranty Single 4GB DDR3 Laptop Memory Module - 1333MHz Unbuffered CL 9 SODIMM Memory 9-9-9-24 1.5V Designed for current generation notebooks, mini-PCs and netbooks Ultra Stable Laptop Memory from Corsair - the Leader in Performance Memory Solutions Microsoft Windows Vista and Windows 7 operating systems Ultra Stable Laptop Memory from Corsair - the Leader in Performance Memory Solutions Designed for current generation notebooks, mini-PCs and netbooks Microsoft Windows Vista and Windows 7 operating systems Single 4GB DDR3 Laptop Memory Module - 1333MHz Unbuffered CL 9 SODIMM Memory 9-9-9-24 1.5V Lifetime Warranty