Neoseeker has published a review of Gigabyte's 680i based N680SLI-DQ6

The overclocking potential of this board is excellent - with a 7X multiplier I was able to reach a stable 485MHz FSB, which while not as high as the 505MHz FSB I saw on an Asus P5B-E Deluxe is still an excellent result

Don't get me wrong though, I did manage to get to a stable 485MHz - but I had to jump through proverbial hoops to get there, including having two 12c
63CFM fans blow on the passive chipset heat pipes.

Gigabyte 6-Quad N680SLI-DQ6 Review