i have a system whose configuration is following-: Intel pentium D 3.0 GHz, Intel original motherboard 946, Transcend RAM DDR2 667 Mhz 512MB clkspd=5, Kingston Ram DDR2 667 Mhz 1 GB clkspd=5. I want upgrade my memory, so i want to purchase a 2 GB DDR2 RAM Stick 667MHz clkspd=5. But now it is not available in the market. but one of the shopkeeper tells me to purchase 800 MHz it will run on my motherboard. Can this be possible? Does my above said RAM works fine with my new purchased 800 MHz RAM? Please suggest me the good solution?