Kingston Technology HyperX 4 GB Kit (4x1 GB Modules) Desktop Memory 4 Quad Channel Kit DDR2 1066 (PC2 8500) 240-Pin DDR2 SDRAM KHX8500D2K4/4G Includes four 1GB modules of 1066MHz Class 5 DDR2 Desktop 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 desktop computers From the industry leader in PC memory Non-ECC 240-pin unbuffered DIMM type