HIS' Radeon HD 5850 trailed behind the GeForce GTX 285 by a small margin at 1680x1050 and 1920x1200 in Crysis Warhead. At a 2560x1600 resolution both cards averaged only 25fps, making them 14% slower than the Radeon HD 5870.
In Enemy Territory: Quake Wars, HIS' Radeon HD 5850 was 16% slower than the Radeon HD 5870 at 2560x1600, delivering an average performance of 89fps. It was also 31% faster than the Radeon HD 4890, which was the next fastest graphics card tested in this particular game.