How much can I underclock our vga? I have set 100/250 (sapphire 3850) and I wonder if I can go lower without doing any damage. Furthermore, I put the 2d and 3d voltages 1 step lower, and it seems rock solid atm (0,974 and 1,094v). Ah, it seems there isn't any way to control fan via bios, even if I u...