Following setup was used during our tests:
AMD Phenom II X4 975BE @ 4GHz
4x2GB G.SKILL Ripjaws 1600MHz CL7
2x1TB Hitachi HDD in raid0
Asus M4A785TD-V EVO
Asus Radeon HD6850 DirectCU 1GB
AMD Radeon 6790 1GB
Radeon 6850 has a slight lead in 3DMark11 test. The difference is about 500 points and the test did run a lot smoother on 6850 than on 6790. The extra shader units and ROP:s in 6850 are the reason for the difference.
As with 3DMark11 the results in Vantage are similar. 6850 has a slight lead over 6790.
Cinebench test software measures the OpenGL performance of graphics cards. In this test both 6790 and 6850 gave about the same results. The reason for this is unknown and even after multiple runs the results stayed round about the same.