4.0GB PC-5300 DDR2 667MHZ SO-DIMM 200 PIN MEMORY MODULEOTHER WORLD COMPUTING OWC 4GB DDR2 SDRAM Memory Module For Notebook, Desktop PC 4 GB (1 x 4GB) DDR2 667 PC2 5300 DDR2 SDRAM 667 MHz CL5 1. 80 V Non ECC 200 pin SoDIMM VPN: OWC5300DDR2S4GB SKU: RSC957863 UPC: 4 GB of memory to heighten your computer's performance Up to 667 MHz memory speed for remarkable multitasking capability 200 pin pin DDR2 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate