Foxconn has in the BIOS, several settings for overclocking your CPU. From our tests, we found ourselves limited to 280FSB, at least with the setup we used. We used an E6600 processor for the overclocking tests:

We tried the preset overclocking settings, and only Step2 (280FSB) was bootable:

We also tried several manual settings, however we didn't have much luck overcoming the 9x multiplier and 280FSB barrier. The voltage settings option is not the best, since it provides relative offsets from the default (whatever that may be), so you have to try by feeling around in the dark as it were: