What Vcore is your CPU running at? You'll need at least 1.75v to get it stable at 2.3GHz, and it probably won't go much higher if you want it to remain stable and not get too hot. The default 1.65v will not allow you to overclock to the speed you are trying to run at.
Make sure you have a good heatsink/fan, and keep an eye on the cpu temps (enable overheat protection in the bios). If you overclock to 2.2 GHz (same speed as 3200+) then your heatsink/fan should be rated for a 3200+ cpu. At 2.3GHz you need a pretty decent heasink/fan. You should be able to hit 2.3GHz without much problem, but getting higher is not worth the extra risk, and may not be possible with your particular cpu (unless you were lucky and got a good one).
Download and run Prime95 (
http://www.mersenne.org/freesoft.htm) to check if your system is stable, and if it fails, then lower your clock. You can increase Vcore up to max 1.85v, but I wouldn't recommend it as it puts your cpu at risk, and the returns you get are minimal. Personally, I wouldn't let your CPU run above 50 deg C, and would lower the clock to ensure that it doesn't get any hotter than this. Mine runs at 2.3GHz and averages 40 deg C (sys temps 20 deg C) without much problem.
If your CPU fails, then you have only yourself to blame, so make sure you understand this before going any further. Good luck.