After some further tweaking of voltages and GTLs I got this 9450 completely stable at 447x8. Ran OCCT for 2 hours and Prime for 13 hours without any errors.

450x8 would run 3DM06, Cinebench R10, DVD Shrink 3.2 without problems but Prime and OCCT would give errors after 20-30mins.

This was using the following voltages:
Vcore: 1.45V (could probably be lowered a bit more)
Vmem: 2.19V
Vnb: 1.66V
VTT: 1.438V
GTLs: 75 75 80

This was a far as I got with this 9450 before I returned it yesterday.
Unfortunately this CPU was a bit of a dissapointment as it's very limited by FSB and low multi.
If I was spending my own money I think I'd rather go for a E8500 that might hit close to 5GHz with high FSBs.

Now I've got two QX9650s to try out. One week34 ES and one retail week 39!