Quad core vs 2 x dual-core?

["Scott R. Ehrlich" <user=81@nabble.blu.org>]

 I have a dual-core Precision 690 system whose application dictates 4 cores. 

As such, are there any known performance issues or anything else that would 
differentiate my adding a second same-type dual-core processor vs 
swapping/replacing the existing dual-core with a single quad-core processor? 

Thanks. 

Scott 

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