The last BIOS I show as being released for the Hunter Cave board was TC0048P. If you are already running on this BIOS, then you have all the knobs that you are going to get. If you need this BIOS file, let me know and I will post here.
Let me add that this board was part of the Media Series and not focused on overclocking. You want the DP55KG Extreme Series board for that.
...S
