Viper Lair has posted a review on the ASUS P5N32-SLI Deluxe Motherboard

While we can get hard numbers showing the improvements of SLI X16, we'd be hard pressed to tell you if our gaming experience was any better. With the current crop of games, the experience was no different between the MSI P4N and ASUS P5N32-SLI boards, but this may change with newer hardware and games. Those of you currently using solid SLI X8 boards probably won't lose too much sleep if you hold off SLI X16 boards at this time.

ASUS P5N32-SLI Deluxe Motherboard Review