Performance in Games and Synthetic Benchmarks
We could not test Battlefield 2 on the new platform as the game was unstable and even refused to start in SLI mode. The other games worked normally, so the overall stability of the ASUS A8N32-SLI Deluxe is high.
Performance in First-Person 3D Shooters
The Chronicles of Riddick
While there is some difference between the mainboards on the nForce4 SLI and the nForce4 SLI X16 in the less difficult FSAA modes (and the difference is not in the favor of the latter), the gap vanished completely as soon as we turn on 6x and 16x antialiasing. Obviously, the two full-width PCI Express x16 slots constitute no advantage for this game. Note also that comfortable play is quite possible in 1280x1024 resolution with turned-on 8x FSAA.
The ASUS A8N32-SLI Deluxe is 1fps ahead of the older mainboard only when we use 8x FSAA in 1600x1200 resolution. This advantage amounts to less than 5% and it is probably due to measurement error rather than to any benefits from the newer chipset.