I'm not sure anymore which mb, cpu and sticks we are talking about? If this is the A8N32-SLI DELUXE you should set sb -> nb to 4x, also the k8 -> nb to 4x... no need to enable overvolt of sb, nb or ht.
Try different volt for sticks... 2.6, 2.65, 2.7, 2.75, 2.8, 2.85 is really all you need to try if it's samsung tccd or uccc, at 2.85 and above they get really hot And 2.85 is only for emergencies! ;) Any higher than 2.9 on samsung is not recommended at all!