What's the difference between the processors offered 2012 Mac Pro

I am trying to understand the difference between the Nahalem 2.8Ghz quad Core inel processor and the 2.4 Westmere Quad Core- ( 8 cores ).
What are cores? And which processor will work best with large images and Final Cut Pro editing?
thanks

to understand processors  | what to buy?
http://macperformanceguide.com/Reviews-MacProWestmere-Handbrake.html
http://en.wikipedia.org/wiki/Intel_Xeon#3600.2F5600-series_.22Gulftown.22
http://techreport.com/articles.x/19196
http://ark.intel.com/products/47917/Intel-Xeon-Processor-W3680-(12M-Cache-3_33-G Hz-6_40-GTs-Intel-QPI)
GHz still rule but so does 48GB RAM for those large images.
Hence the "sweet spot" 6-core 3.33GHz w/ 24GB RAM (minimum, 3 x 8GB, or iwth 3 x 16GB).
My feeling about the 2.4.... no, too slow.
Poor man's that is handy with processors: buy the 2.8GHz and upgrade yourself and save $1200 by buying W3680 (the 3.33 6-core) yourself from Amazon or others like Buy.com ($620).
This site really should help answer what and how to configure. Note that the 6-core is listed in Apple Store under the "4-core" so hidden from view. Or from Apple Store Specials refurbished models.
http://macperformanceguide.com/index_topics.html

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