We learned that Nforce 790i will have two versions, but we don’t really know what will be the key difference between them. Our sources are quite sure that the Ultra will mean that it will run FSB 1600 and some faster memory speeds and it might have an additional feature.
Nforce 790i vanilla won’t have the IGP core integrated that Nvidia wants Hybrid SLI in the future. That is a new chipset that is scheduled for Q2 launch.
The key thing that Nforce 790i brings is certainly DDR3 support, as it brings Nforce chipsets to the X38 / X48 level.