... you get more L3 cache
people keep saying this; for general reference:
2.0 Ghz has 6MB of cache: http://ark.intel.com/Product.aspx?id=53463
2.2 GHz has 6MB of cache: http://ark.intel.com/Product.aspx?id=50067
2.3 GHz has 8MB of cache: http://ark.intel.com/Product.aspx?id=52227
the 2.3 being the $250 CPU upgrade option on the 2.2.
(alternatively, go here: http://store.apple.com/us/browse/home/shop_mac/family/macbook_pro?mco=MTM3NjU5MzU and click 'compare' below.)
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