Hi NG...in this mb the system bus is set by only a switch...(100Mhz - Auto)...in auto my system bus is correct....it's 133...from bios can I increase it max 165, and my clock of Agp and Pci is too high...How can I set system bus to 166 or 200? My cpu is brown and cpu ID is 680... Merry Christmas and Happy new year (sorry for my english... ^_^)