Yeah, coldbug is mobo related. Out of the 4 phenoms I've tested, on my 9500 had a slightly higher coldbug at around -35C or -30C. All the others boot at below -40C but its pointless because cold hurts your overclock. 0C should be interesting though, its cold enough to keep the temps down alot, but also warm enough that it won't be as limiting as my vapo.