Originally Posted by
Dexiefy
GTX 4xx series= Radeon HD 5xxx series
GTX 5xx series= radeon HD 6xxx series
(not mentioning older series as they arent worth buying)
You basically follow numbers here.
gtx 460=hd 5850 in relative power while gtx 470= hd 5870 in relative power. In 500 series its pretty similar, GTX 560ti=6950 and gtx 570=hd 6970, gtx 580 is the best single GPU card out there and then you ahve RAdeon hd6990 and GTX 590 which are basically a SLI on 1 board and are absolute beasts. However such SLI isnt the best solution as there are always issues with drivers and alike.