Mine has been running fine now for almost two weeks 7x24. OC'd to 3.2Ghz / 400FSB. Temps are 30-31c idle, ~34c load. Super cool encoding monster..
BTW, my old box was a 2.6 P4 Northwood, so I'm easy to impress.
If anyone else is still wondering about board compatibility. I just successfully installed my X3350 on a Gigabyte GA-EX38-DS4 with the F2 BIOS. It works perfectly - no issues at all. It really is the same chip as the Q9450, right down to the processor errata.
I did send an email to Gigabyte...