4.0GB PC-6400 DDR2 800MHZ SO-DIMM 200 PIN MEMORY MODULEOWC 4. 0GB PC6400 DDR2 For Notebook, Desktop PC 4 GB (1 x 4GB) DDR2 800 PC2 6400 DDR2 SDRAM 800 MHz CL6 1. 80 V Non ECC 200 pin SoDIMM Lifetime Warranty VPN: OWC6400DDR2S4GB SKU: RSC332437 UPC: SoDIMM 4 GB memory allows you to have more programs open at a time 800 MHz speed and CL6 latency to execute routine softwares at a steady pace DDR2 800 PC2 6400 interface synchronizes electrical and clock signals for an efficient data transfer rate