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Well, they run in sync with the CPU, not the FSB.

SDRAM- Synchronous Dynamic Ram.

Depending on your CPU, you need RAM that is fast enough to keep up with it. SDRAM stores data on the clock ticks of the CPU crystal.

DDRSDRAM (Double Data Rate SDRAM) does the same thing, but also on the spaces between clock ticks.

From Wiki about FSB:

The number of transfers per clock cycle is dependent on the technology used. For example, GTL+ performs 1 transfer/cycle, EV6 2 transfers/cycle, and AGTL+ 4

http://en.wikipedia.org/wiki/Front-side_bus

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