AMD Radeon HD 7850 & HD 7870 2 GB @ techPowerUp
 

Today AMD released their new Radeon HD 7800 Series, which is based on their new 28 nm Pitcairn graphics processor. The HD 7850 and HD 7870 offer a significant performance increase over the previous generation - up to 40% faster in our testing. Power consumption is also at a new record low, putting these cards in the leading performance per Watt spot.

http://www.techpowerup.com/reviews/AMD/HD_7850_HD_7870/