PC Perspective has posted a review on the Asus A8N32-SLI nForce4 SLI X16 Motherboard

All the way back in August of this year NVIDIA unofficially announced the X16 versions of their X16 nForce4 chipsets for AMD and Intel platforms by partnering with Dell on a new gaming system. Unfortunately for the media and for gamers in general this did not allow us to get a hold of a motherboard to test and review. We were simply left with vague statements from NVIDIA and partners that the X16 chipsets were going to be the "ultimate gamer's platform" and the like. Well now we have a retail motherboard in house from Asus, the A8N32-SLI, and we can finally get at the information we all wanted.

Asus A8N32-SLI nForce4 SLI X16 Motherboard Review