Fundamentally it comes down to I/O performance between the CPU cores and memory bus. Quad core CPUs suffer from performance bottlenecks with regard to Dual cores which leads to a less of an improvement than one might expect from clock speed alone There are articles here worth a read: http://www.tomshardware.com/2006/09/10/four_cores_on_the_rampage/ As has already been mentioned, if you have four sockets to fill you might as well fill it with Quad cores anyway.... You might find this useful too: http://www.tomshardware.com/2007/08/08/extreme_fsb_2/ Regards Pete David Amiel wrote: > Hello, > > to my mind the most impacting on a SMP server is the synchronisation time > between dies/cores. the time to synchronize 2 cores on different dies is > higher than the time to synchronize 2 cores on the same die. So to achieve > best performances you have to limit number of dies. > So a dual quad core should be more powerful than a 4 dual core. > > You can verify this here : http://www.spec.org/cpu2006/results/cpu2006.html > > results on a 2 chips server are ~20/30% higher than a 4 chips using the > same processor > > regards, > > David Amiel > > Le Sam 1 septembre 2007 04:51, Erick Perez a écrit : > >> Hi people, >> Do you have pointers to web documents that help me make comparisons >> between buying a server with two quad core 2.33 ghz or buying a 4 dual >> core 2ghz server? >> I am trying to answer a question of performance. It is not important >> the redundancy/failover or the price of the server. Just the >> performance. >> obviously all the hardware specs are the same, the question is the CPU. >> >> >> -- >> ------------------------------------------------------------ >> Erick Perez >> Panama Sistemas >> Integradores de Telefonia IP y Soluciones Para Centros de Datos >> Panama, Republica de Panama >> Cel Panama. +(507) 6694-4780 >> ------------------------------------------------------------ >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> http://lists.centos.org/mailman/listinfo/centos >> >> > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20070901/3bba7266/attachment-0005.html>