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.


--
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Erick Perez
Panama Sistemas
Integradores de Telefonia IP y Soluciones Para Centros de Datos
Panama, Republica de Panama
Cel Panama. +(507) 6694-4780
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