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Looks like they lowered the price of the 6400+ Black Edition to account for the new 6400+ Retail ed which includes a heatsink and fan. That means you can buy the Black Edition and add a $30 fan better than the one that comes with the retail versoin and they would come out to the same price.
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103191
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103191