^.^ Yes you can. There are certain multipliers the speed of the RAM goes through which determins the final speed. For instance, my FSB is running at 400 Mhz. The ratio is 2:3, making the RAM run at 1200Mhz. (600x2) You can change that ratio to different speeds, but without severely raising the voltage, and dropping the timings, you won't be able to stabily overclock your RAM that way.