EVGA GeForce GTX 680s Superclocked Edition have a core clock of 1058 MHz, where reference model has 1006 MHz. Boost clock was increased to 1113 MHz (1058 MHz default), while memory clock was slightly overclocked to efficient 6208 MHz (6008 MHz by default).
There are two variants of Superclocked Edition card. First is a reference design with increased clocks mentioned ealier. This model will be available for $519.99. Therefore we have a model with backplate which will be available for $529.99.
Both cards should be expected next month.