Which of these are the best?
http://www.zotac.com/products/graphics-cards/geforce-700-series/gtx-770/product/gtx-770/detail/geforce-gtx-770-amp-edition.html (770)
or
http://www.zotacusa.com/geforce-gtx-680-zt-60102-10p.html?
http://www.zotac.com/products/graphics-cards/geforce-700-series/gtx-770/product/gtx-770/detail/geforce-gtx-770-amp-edition.html (770)
or
http://www.zotacusa.com/geforce-gtx-680-zt-60102-10p.html?