Originally Posted by NickB
Anyone had a chance to try FSX with the new Radeon 3870 X2?
Specifically interested in how it would compare to the 8800 GTS/ 8800 GTX
In general ATI cards perform much worse than Nvidia cards in FSX, even at CPU bound resolutions, which makes no sense to me, and which even Phil Taylor can't explain, and he is the lead Program Manager for FSX, was a DirectX engineer for a time, as well as a hardware engineer for ATI. So for that reason I would avoid ATI cards for use with FSX.
Here you can see the 8800 Ultra is a full 25% faster than the HD3870 at 1920 with AA.
Other than that FSX doesn't need a graphics card faster than an 8800. I run mine at 1600x1200 with 16xS supersampling and 16xAF and I'm still CPU bound at 3.5GHz. So an 8800 is more than enough power for FSX, and puts the bottleneck squarely on the CPU.