I'm pretty sure that we could win an award for the most blatantly obvious article conclusion ever if we simply noted here that "the GeForce GTX 260 Core 216 is faster than its predecessor with just 192 Stream Processors", although in fairness that conclusion is (of course) entirely true. With other factors beyond raw shader processing falling into the equation in any real-world gaming scenario, we never really see the full benefits of this increase in Stream Processors, but dependant on the title it does tend to offer somewhere in the realm of a 5-6% performance increase - Sometimes its more, sometimes its less, but overall of course this is nothing to be sniffed at when faced with the prospect of buying either part for basically the same price.
http://www.elitebastards.com/cms/index.php?option=com_content&task=view&id=656&Itemid=29