Kingston Technology HyperX 4 GB Kit (2x2 GB Modules) Notebook Memory 4 Dual Channel Kit DDR2 800 (PC2 6400) 200-Pin DDR2 SO-DIMM KHX6400S2ULK2/4G Includes two 2GB modules of 800MHz Class 4 DDR2 Notebook Memory Utilizes HyperX module with faster latency timing for higher performance and speed Specifically designed and tested for compatibility in various makes and models of notebook computers From the industry leader in PC memory Non-ECC Ultra Low-Latency 200-pin unbuffered SODIMM type