My graphs really do not look flat in FC2 or Hawx at 1920

Anyway, the bandwidth might be enough for 5850, due to the crippled Cypress, but it is not enough for 2 "full-option" Cypress like HD 5970 has. What is changed from HD5870? The bus is the same, the number of shader procesors is the same, the only different things are the clocks. Which give less bandwidth/ GPU compared to HD 5870.