My personal experience is that boosting BCLK is bad news. I could pass all stress tests, even at 103 MHz, but would get BSOD in everyday applications, even at 101. When I put it back to 100.0 all that went away. Still running the CPU at 44x though.

I also saw other symptoms than BSOD, such as fan sensors screwing up. Moral: maybe you can overclock the CPU/Z68/mem, but maybe not the rest of the board...