there were a few fsb holes for me with Q6600 G0, A1 and P30 after 400fsb. also i cannot get the quad stable at all with 1.5v cpu fsb while 1.4v works until 456 fsb where i hit another wall either cpu or mobo fsb limited. also sometimes the board changed the multi to 6x at POST, usually on a bsod.
i would try +5fsb or so at a low multi to see if it's just a fsb hole.
@Matt C try 1.4v fsb might be problem as it was with me.
edit: or try 4x HT link on SPP/MCP
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