DIMMS at 333mhz aka PC2700 Ram, the 333Mhz is the Front Side Bus Speed, and this has a multiplier to reach the base CPU core clock or overclock the clock of both.
333Mhz is the frequency at which bits of data can travel on the wavelength of the square wave. The Data and Address Lines are where the data is addressed through Address Lines and Read and Written through Data Lines. There is also an interrupt that tells when to trigger the addresses etc.
The data coming and going from the Ram is not at exactly 333Mhz in Rate, but slightly slower do to interrupt delays and processes involved with reading and writing data that eat up clock cycle time for each tick of the 333Mhz front side clock rate and each instruction that has to execute to move on to the next instruction/task. This is due to the fact that your computer is a big virtual mechanical machine, and everything has to work like clock work, like meshing gears sort of speak. Devices/components have to wait for other devices/components all the time even when there are multiple address lines to communicate on like a highway with many many lines all full of traffic at the same time....And when your system is idle, there is still a lot of traffic going on. not as much, but the idle computer is far from idle under the hood.
Hope this helps answer the question about Data and 333Mhz FSB Ram.
