hello...im overclocking my old pc...its an intel celeron 320 prescott 2.4ghz...but the problem is...i could only set it to 2.7 ghz...in the bios setting,it has only options that allow me to set until 2.7ghz..i cant set them manually...and i cant set my voltage also...its a msi 7104 20a mobo...did i miss any setting in the bios?