The ACC function is part of the AMD chipset, specifically the the SB750 and the SB710 which allows trying to activate the additional cores present in your chip. However your board uses a Nvidia chipset not AMD, at least one of the Newest Nvida chipsets does now support enabling the extra cores but I can't say that yours does or not.
On a good note since your processor is a BE you can change the clock rate currently at (auto=15.5) for 3.1 ghz by using manual clock settings for the cpu.
Your motherboard offers additional software overclocking as well and is documented. Just don't jump too high too fast! good luck