Originally posted by Arcadian:
Moridin, I believe you are misusing the terms "synchronous" and "asynchronous". Synchronous means that data is latched on a clock, while Asynchronous means there is no clock present.
I was referring to the chipset, not the motherboard.

In the context of the chipset I think this is exactly what is happening. An asynchronous chipset has no clock signal that fixes a relationship between the memory bus and the FSB so the two operate independently. A synchronous chipset on the other hand does have a clock signal that fixes a relationship between the FSB and the memory bus.