Hello Zeldascorn,
From my limited knowledge of overclocking, you can only do what the motherboard will allow you to do. You'll need to consult with the motherboard manual or contact MSI directly to find out what options are available to you.
I don't believe there is any way around the BIOS. They either include overclocking options, or don't. If the multipliers do show up in the BIOS, but are locked, there may be an option you have to change to open them up. But if the multipliers don't show up in the BIOS, I'm pretty sure there is nothing you can do about it except see if there is a BIOS update that includes overclocking options.
Hope that info helps you!
