i also thought that it wasn't related with high fsb/clock but it turned out that this was the reason that i couldn't make stable my c2d.

i hope i helped

these are my voltages i think ( i am not sure because i am @ stock right now)
vcore 1.35
vdimm 2.25
fsb 1.4
nb 1.45
sb 1.6
ich 1.057

for this result:
http://www.xtremesystems.org/forums/...0&d=1186523872