Hardware web site Hexus.net had the chance to participate in a pre-release demo at ATI's HQ in Canada. ATI's representatives showed how CrossFireX performance scaled from a single Radeon HD 3870, through to a Radeon HD 3870 X2, then to an X2 with the single-GPU 3870, and, finally, with two 3870 X2s in tandem.
Five games were benchmarked at 1,920x1,200 and 2,560x1,600 with high degrees of image quality. The five games comprised of Call of Duty 4, Half-Life: Episode 2, Unreal Tournament 3, Crysis, and Bioshock.
The results showed that CrossFireX, in its three- and four-GPU incarnation, works well enough in DX9 titles run. A single-GPU Radeon HD 3870 is no slouch but performance can be up to 3x better with dual Radeon HD 3870 X2s. However, scaling is comparatively limited with the DX10 API and Crysis with limited gains reported at high resolutions.
The complete benchmark results are available at http://www.hexus.net.
Implementations of CrossFireX will be shwowcased at CeBIT trade show next march.