Don't use windows based OC'ing programs....get familiar with your BIOS and use that....it's the safest and best way to OC
Plus you can look like an UBER-1337 nerd infront of your friends when you go changing random things....just change the date and time and be like "Yeah....see this was originally a 4 here....I overclocked it to 5" which translates you changing the month from april to may
However clockgen can give my board an extra half volt of voltage, so I can use that to get a few more mhz, even though it's a bad idea. This is how I got up to just under 2.7ghz