A-Grey, u r the real deal!!!(not diminishing other's contributions) Have been following this thread ever since and am currently running my Q9550 @ 495 x 8.5...which i cud never get to be stable above 450MHz before.Currently running vCore @ 1.41; have to try reducing it a bit.and yea, its the Clock Skews that played the most important part in the >450Mhz clocking.I am currently running CPU Clock Skew @ 300ps and NB clock skew @ 200ps.