Overclocking is fine, you just need to be patient and careful. Never boost the speed immediately, you should carefully set the speed higher by increments. Once you get to a certain speed, torture test it for a few hours and if no errors occur, keep going until you get errors, then set it down a little bit and you have your maximum limit.
Overclocking is a time taking thing, you can't just set things and BAM, expect it to work.
Like I said, sometimes, it would hang during bootup process out of the blue. It probably didn't like the OC and BIOS has crashed, leaving it an expensive paper weight. Seti's place tihnks I fried everything. I would doubt it because the CPU would still respond with the basic power up...and heat up.