I doubt your motherboard has any control on overclocking that CPU. The bad thing about people who want to overclock with a prebuilt system is that fact. The bios is so limited and even disables the most archaic methods of overclocking or gaining performance. This is simply because of two things; warranty issues and upgrading. Locking you out of these abilities keeps you from frying something like the CPU and getting it fixed under warranty even if you did technically void it. Second, now you have to buy new hardware simply to get an improvement in your processor.
On most prebuilt systems, even if you try overclocking through software; since it's disabled within the BIOS, it won't allow the software overclock to override the settings. So basically you'd be clicking apply and changing nothing.