Flight Simulator X
Flight Simulator doesn't say much about the 9800 GX2's performances except that it isn't really that much faster than the 8800 Ultra. It's even slower at 2560x1600 with the filters activated. On the other hand, the Radeon HD 3870 X2 seems to be clearly left out as it doesn't even allow smooth rendering in 1920x1200. Multi-GPU solutions aren't only useless when playing Flight Simulator, they can even be harmful in some cases.