evyosh :
say i am buying this. the card is like 6 years old and how much will it be worth it if paying? whats the brand new price on the market value?
Do you mean the 680? Its actually about 4 years old, came out around March of 2012. When it was released it was the top end card so it was about $500. You can't find them new anymore except maybe Ebay. A used card is generally around $200 (2GB version) to $250 (4GB version).
In terms of performance they are between the GTX 960 ($200) and GTX 970 ($300)