Dear Arpad Muranyi, Thanks for your reply so fast. Base on the example of DDR2 533/400Mhz that I mentioned the previous mail, do I need to consider the possibility that DDR2 533MHz can cover DDR2 400MHz on performing simulation? Even I know almost high frequency chips can cover low frequency ones on real DIMM performance. Thank you. Best Regards, Joseph Kao ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu