[CentOS] OT: 4 dual cores agains 2 quad cores

Peter Farrow peter at farrows.org
Sat Sep 1 12:28:54 UTC 2007


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.htm


More information about the CentOS mailing list