There are 2 golden rules for any overclocking.
#1. Never use software to overclock hardware (GFX card excluded)
#2. Never overclock all at once.
Please do yourself and your hardware a favour and don't use any software based overclock.
Whilst it may not be as easy, it's a heck of a lot more satisfying to overclock via the BIOS, and gives you much greater control to play around, and whilst it's slower (due to having to reboot) it forces you to make calculated incremental moves, rather than a massive change all at once, as if something goes wrong you have no visibility on what went right!