Most memory is synchronous. SDRAM = Synchronous Dynamic Random Access Memory. DDR SDRAM Double Data Rate SDRAM.
I'll let Kingston explain it since they did such a good job of it.
<A HREF="http://www.kingston.com/tools/umg/umg05a.asp" target="_new">"SDRAM is designed to synchronize itself with the timing of the CPU. This enables the memory controller to know the exact clock cycle when the requested data will be ready, so the CPU no longer has to wait between memory accesses."</A>
RDRAM = Rambus Dynamic Random Access Memory is allso configured to work with the system clock.
Only older forms of memory are not sycronized to the FSB. (EDO, BEDO, FPM, etc.)
I hope this helps.
<b><font color=red>Fredi</font color=red> <font color=red>Fredi</font color=red> He's our man! If he can't do it no one can!</b><P ID="edit"><FONT SIZE=-1><EM>Edited by Bum_JCRules on 01/14/03 10:54 PM.</EM></FONT></P>