Performance in Simulators
Graphics cards from the Radeon X1000 family do not support vertex texturing and cannot use the appropriate shaders to render the water surface with the highest possible quality in this game. This quality is only achievable on Nvidia’s GeForce 7 cards.
Although the game engine is optimized for the GeForce 7 architecture and uses OpenGL by default, the GeForce 7950 quad-SLI has problems here, too. Like in many other cases, it provides a zero performance growth. Note, however, that the CrossFire system does the same, so this is probably the game’s problem rather than ATI’s or Nvidia’s.
The GeForce 7950 quad-SLI is sufficiently fast in 1600x1200, but the single GeForce 7950 GX2 offers the same speed (being in fact a SLI tandem, it allows to use SLI AA).
It’s important to have as high a frame rate as in first-person shooters to play a flight sim normally. An average speed of 60fps and higher is what you need. That’s why if you use the hardest FSAA modes on your Force 7950 quad SLI or Radeon X1950 XTX CrossFire, you should limit yourself to 1280x1024.