Re: Dual-Gigabit ports on the nForce 790i Ultra SLI
For the most part, it's a marketing gimmick for home users. You'd get the real benefit of having two ethernet ports, if you're looking at it on a server level.
And no, it does not increase internet speed if you connect both. That's where the gimmick part comes in I guess. Most people would think, "ooo...There's two internet ports. Now I can have double the speed".