SourceThe ZOTAC AMP! Edition GTX 680 makes use of Dual 90mm fan cooling design which cools a large aluminium fin array heatsink located underneath it equipped with four copper heatpipes. The cooler cools the GPU by 11C compared to the reference version. The GPU features a base clock of 1110MHz and Boost clock of 1176MHz, Other specs include a 2GB 256-bit memory which runs at the stock 6GHz effective speed. Power is provided through dual 8 pin connectors.
The ZOTAC GTX 680 4GB is another factory overclocked variant which makes use of the reference design however features a large 4GB memory which runs at 6GHz effective frequency. Core clock is maintained at 1006MHz and Boost clock of 1056MHz.