Hi all... I want OC my current rig. But everytime I tried to OC always fail... zzz... Only can use default overclock profile. Max 7% of my default 2.6GHz so I get 2.77GHz something only...

I tried to raise until 235MHz*13 = 3.05GHz but it failed when reaches desktop... Even 220MHz (No voltage added) also get BSOD when I am playing games...

The 3.05GHz I added +50mv, RAM speed as multiplier... I don't know why my board can't do OC much... But there are many OC settings... Anyone can guide me? Planning to OC until 3GHz or above.

Spec:
Phenom x4 9950BE 2.6GHz 140W
Asus M2N68 (1001)
2x2GB Kingston DDR2 800
Cooler Master Sphere

Thx for advice