Half-Life 2: Episode One
The Radeon HD 2900 XT 1GB has no advantage over the model with 512 megabytes of GDDR3 memory, so we can suppose that the results of the CrossFire platform are going to be the same for the other possible CrossFire configuration. And these results are impressive in comparison with any of the single cards, including the GeForce 8800 Ultra. The average speed is over 150fps even at 2560x1600 with enabled 4x FSAA. The Radeon HD 2900 XT CrossFire even seems to hit the ceiling imposed by the CPU performance in the lower resolutions.
CrossFire technology works normally in the OpenGL environment, providing a 70% performance gain for the Radeon HD 2900 XT 1GB pair in comparison with the single card at 1920x1200 resolution. The single such card is only 1% ahead of the Radeon HD 2900 XT 512MB.