What manufacturer of RAM do you have? If it is ValueRam by Corsair, or a similar manufacturer it ought to take more...
did you try lowering the RAM speed in the BIOS, say to 133 or 166?
The Vcore looks about right, though I don't know the specs for your CPU off the top of my head.
How are your temps? Got good cooling?
What core-type is your CPU? Different cores from the same manufacturer, that are the same model often have different properties.
[SIZE=\"1\"]E6400 @ 3.4 , Noctua 120
7900GT @ 670/1680 , VF900
2 x 1GB Patriot 6400 @ 425
WD SATA 250GB
Neo HE 550
P180 / G15 / MX1000[/SIZE]