some guys fighting in SCDA using Radeon X2900XT, Radeon X1900GT, Radeon X1950XT and Geforce 8800 GTX . They all use same save file of SCDA to make sure pics are taken in same place.
1/2900XT (1280x960, default clock, 4xAA, 16xAF, all MAX, drv: 8.361)
2/X1900GT(1280x960, 550/1440MHz, 4xAA, 16xAF, All MAX, drv: catalyst 7.2)
3/X1950XT(1280x960, unknown clock, 4xAA, 16xAF, All MAX, drv: unknown)
4/GeForce 8800 GTX( 1280x960, unknown clock, 4xAA, 16xAF, All MAX, drv: unknown)
you can see from these four pics, R600 and G80 don't have light reflection on the rear surface of the helicopter. Cause both drvs auto set ShadowTurnOffDegree=2 in SplinterCell4.ini for R600 and G80 when they are in MAX detaill, drvs auto set ShadowTurnOffDegree=0 in SplinterCell4.ini for two R580 cards when they are in MAX detail. We still unknow the reason.
But we can compared the pic quality btw X1900GT and 8800GTX:
Thanks for the comparison tests done by yuen, frankexam and oneping.