Sorry but it's not possible, you have an nvidia chipset...
in order to unlock you need an amd chipset SB710 or SB750, and I belive some
of the newer ones work as well...if you wanna unlock you should buy a new mobo...
if you're on a tight budget I recomend this http/www.newegg.com/Product/Product.aspx?Item=N82E16813128451
no onboard video...but i assume you probably won't need that anyway...
onboard really sucks...