With Enemy Territory: Quake Wars, the Radeon HD 5770 wasn't the only graphics card faster than the Radeon HD 4870, but both Evergreen graphics cards were faster than the Radeon HD 4870. The HD 5750 was 6% faster than the HD 4870 while the HD 5770 was at 12%.
The performance between the Radeon HD 4850 and Radeon HD 5750 under Linux were tied with the Unigine Sanctuary test profile when running at this high resolution. The performance between the Radeon HD 4870 and Radeon HD 5770 were also virtually the same in this demanding OpenGL test.
The Unigine Tropics results panned out the same as the Unigine Tropics, albeit with all graphics cards having a lower frame-rate.