Not to re-open an old thread but that's an old chipset that's not even capable of doing 2000MHz HT, try upgrading to an AMD board with SB710 or SB750 if you want to overclock, I've got my Athlon II x4 640 at 3.8GHz at 1.55v and it's doing so idling 45 degree temps. Core temps are usually around 35 degrees, all this on stock heatsink/fan.
I know you probably bought the board because of it's low price, but there's some serious downsides to that low price.
Just thought I'd mention it because nobody else did.
AMD Athlon II x4 640 3.0GHz @3.8GHz -OC 1.55v
ASRock 880GM-LE AM3
G.SKILL Ripjaws Series 2x2 -4GB 1333 @7-7-7-21
Saphire Radeon HD 5830