if i need a new mobo .which one?

[silent]

If the twinmos doesnt have the winbond chips then it may not be too good for overclocking and that could well be your problem. Shouldnt have thought that the board is the problem especially as you have changed the bios.

how do i know/tell if it has winbond chips - may be stupid q i know

[steve threlfall]

Iirc it says on the white lables on the sticks.