I don't have the Q9450 but I do have the Xeon-X3350 (same thing) and you will find that you need the 0504 bios and even then it will give you the "unknown cpu detected, you need to update the bios to unleash its full potential". Annoying but otherwise the system boots up and you can start OCing.
However, let me say right up front that you should disable load line calibration with the 45nm cpus as it seems to cause voltage instabilities that prevent you from going too far with the OC and also using more vcore than is necessary. Mine is running at 3.6GHz with 1.248vcore. It will run P95 small ffts for hours with all settings at stock other than the vdimm is 2.1, vcore as above, and mem timings at 5-5-5-15. But if I try to run "blend" it halts almost immediately. No amount of tweaking of voltges or timings will allow me to remain stable. The Xeon X3210 that I took out would run 3.8GHz with 1.475vcore and run P95 blend and any other configuration 24/7. I am beginning to think the P35 chipset is not too good for the quad 45nm cpus. I say this because I also have a DFI LP LT P35 T2R that also had a hell of a time running this thing above 3.6GHz. But it is running my Xeon 3110 right now at 4.3GHz with 1.456vcore (not a great chip) and a minor adjustment to the NB vcore.
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