I've searched the Asus site for you and this is what I found:
Found at http://www.asus.com.tw/mb/socketa/a7n266/overview.htm Extreme Overclocking
ASUS offers robust overclocking options to maximize your system performance.
* Easy DIP Switch or Jumperfree™ overclocking from BIOS
* Adjustable VIO memory voltage
* Adjustable FSB/PCI/MEM ratio
* Rock-solid stability
Just don't wait for my answer, I don't have one.
I can give you a tip: Just wait and reply to your own message once in a while, so that it'll get in top of the list and @ the last 5 posts @ the frontpage.