X38 is definitely a restricting chipset.
Don't get me wrong, E0 stepping cpus have definitely proven their worth, but I've been through 2 C1 Q9450s and they're both champion clockers.
So before you fry your Q9550 for an RMA, I'd consider picking up a nice Biostar Tpower I45 and really unlocking the 4+ghz potential of your cpu.
Because really, if my Q9450 can hit 4ghz, most Q9550s should be able to*
*p45 chipset required...
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