This time around, we are looking at boards based on the single GPU nForce4 Ultra chipset. Keep in mind that nForce4 Ultra and nForce4 SLI are the exact same chipset, with the only difference being that the SLI function is enabled on the SLI version. There are no performance differences in the SLI and Ultra chipsets, or even the base nForce4 for that matter. These chipsets differ only in which features are available to the buyer - but they beat with the same heart.Read more at AnandTech
Seven nForce 4 Ultra motherboards reviewed

AnandTech has taken a look at seven different nForce 4 Ultra based motherboards from manufacturers such as Abit, Biostar, Chaintech, DFI, ECS, Epox and Winfast.