Test Drive Unlimited
We already saw this phenomenon in Windows XP and crossing over to Windows Vista or using Catalyst 8.3 changes nothing. AMD hasn't profiled Test Drive Unlimited to work in multi-GPU configurations. NVIDIA has done so. The result is a very large gap, with the 3870 X2 being two times slower on average than a simple 8800 Ultra. On the other hand, the 9800 GX2 widens the gap. There's a nuance here. It varies between 26% and 67% at 1920x1200, but the 512 MB limit reduces the gap to 33% and 18% at 2560x1600. This card, like the 8800 Ultra, can't run the game smoothly when antialiasing is on; 28 frames per second is too low for Test Drive Unlimited.