if u relly want to oc u can try clockgen. try google it. i also use cheap mainboard that limit my htt @250mhz but using clockgen i can do 275mhz @cas 2.5

haha thats why i dont buy branded pc.. but he still can try open the case and try to look at the chip for clock generator. i m not really familiar wth intel.

with clockgen u can overclock your proc in windows. u can download it free try google. in more easy way. i'm also feel sick with my board but when i try using clockgen i'm able to overclock up to 2.5 GHz from original 1.8 GHz amd64 300+.
this doftware let u adjust the fsb/htt at ur proc using a generator chip at your board. even a laptop can overclock using this method.
good luck