What should be the best BIOS when using subzero cooling?

I've been trying to get the board stable for hours using both an E6300 and E2160 and a Mach2. It seems like the max stable fsb on the mach is even lower than on air (360x9 not stable on mach, stable on air) no matter what voltage I set. Both ram and NB don't get too hot, cpu temperature is at -50.

Does anyone have a suggestion before I get rid of this board?