I do have to agree with my mate "pt" (same country, hi there

). Very few Intel mobos have OC capabilities to begin with, and even fewer have OC available through the BIOS, let again through software...
In adition, mobos with integrated graphics (I suppose the "G965" on its name referrs to the chipset) are not only lousy OCers to begin with (you do have the integrated graphics core pulling your OC top down...) but also don't usually bring many (if any at all) OC options. Many of them even have PLLs that are not overclockable...
Only Abit makes an AM2 mobo (NVIDIA 6150-based, integrated graphics) with full OC capabilities, and ASRock, Asus and Gigabyte (that I know of) make some of them (again, with integrated graphics, either Intel or AMD) with some OC functions...
In adition, most OC software only works with popular PLLs, those that appear on the top-selling mobos. For the others, most times the programming effort is just not worth it, or it becomes impossible to test it...
If you really want to OC your board, go to an OC-friendly board, just like "pt" said. P965, 975X, and NVIDIA 650/680 SLI or AMD RD600 are great chioces, and you can get them beginning at €135 (P965-based), sometimes even less (not great OCers below that mark, mind you, although there is even a €100 P965 board).
Cheers.
Miguel