Far Cry 2
Despite its 900MHz clock rate, the Radeon HD 6870 falls farther behind the Radeon HD 5850 as the resolution grows up. The difference amounts to 7% at 2560x1600, which may indicate a lack of memory bandwidth. Fortunately, this only refers to the average frame rates whereas the bottom speeds are roughly the same. Moreover, each card makes the game perfectly playable. The Radeon HD 6850 can only compete with the cheaper GeForce GTX 460 768MB and isn’t very successful in doing that at the resolution of 1600x900. On the other hand, the game runs fast enough at 2560x1600 even on the junior Radeon HD 6800 series card.
This game is tested without full-screen antialiasing but with tessellation turned on.
The high system requirements of Metro 2033 with tessellation turned on are quite apparent. The GeForce GTX 470 is the only card to deliver more than 40 fps at 1600x900, its bottom speed being as uncomfortably low as 12 fps. The Radeon HD 6870 is a mere 1-3 fps better than the Radeon HD 5850 in terms of bottom speed, which too small an advantage to make any conclusions about the new tessellation unit or other optimizations in the Barts core.
We can again state that the Radeon HD 6800 is slower than the Radeon HD 5800 series.
S.T.A.L.K.E.R.: Call of Pripyat
We use the game’s DirectX 10.1 and DirectX 11 modes for graphics cards that support them.
The new cards are more or less competitive to the older Radeon HD 5000 series in this shooter. Tessellation isn’t used extensively in S.T.A.L.K.E.R.: Call of Pripyat, so the new GPUs can’t show their best. As a result, the larger computing resources of the Radeon HD 5800 series make up for the high frequencies of the Radeon HD 6800 cards.
The Radeon HD 6870 is as fast as the GeForce GTX 460 1GB which is officially priced lower by $40. The junior model of the new series looks good, delivering the same speed as the GeForce TX 460 768MB.