So, I am going to be gaming mostly, using only one monitor at 1080p, I play almost all types of games, the PSU I have is 850 W, I'll be overclocking only ti an extent the stock fan can safely handle, I won't be doing any video editting and stuff and with cost about the same to me.
Edit: Here are the links to both of them just incase.
7970- http://www.flipkart.com/sapphire-amd-hd-7970-ddr5-vapor-x-3-gb-gddr5-graphics-card/p/itmddqq4f84hpvch?pid=GRCDDQPH67G7EYJF&ref=7950e76d-ec46-4ee0-9be3-cad22f893a03&srno=m_1_1&otracker=from-search&query=7970
680 - http://www.flipkart.com/zotac-nvidia-gtx-680-2-gb-ddr5-graphics-card/p/itmd9csqkmzh5uwm?pid=GRCD9CSPFENTHEBR&ref=9a344a62-acda-4de1-b791-e9910a50d0b1&srno=t_1&otracker=from-search&query=gtx%20680
Edit: Here are the links to both of them just incase.
7970- http://www.flipkart.com/sapphire-amd-hd-7970-ddr5-vapor-x-3-gb-gddr5-graphics-card/p/itmddqq4f84hpvch?pid=GRCDDQPH67G7EYJF&ref=7950e76d-ec46-4ee0-9be3-cad22f893a03&srno=m_1_1&otracker=from-search&query=7970
680 - http://www.flipkart.com/zotac-nvidia-gtx-680-2-gb-ddr5-graphics-card/p/itmd9csqkmzh5uwm?pid=GRCD9CSPFENTHEBR&ref=9a344a62-acda-4de1-b791-e9910a50d0b1&srno=t_1&otracker=from-search&query=gtx%20680