Got mine late yesterday - and had to go out last night, so no major testing yet but I did get it started and up to speed late last night.

Q6600 L723A890 from Club-IT.

System is basically whats in my sig.

Vid = 1.3125v
Current Speed: 9 x 445 (4005mhz) at 1.45v Bios (1.43v real)
Stock Vapo cooling for the moment.

Don't know anything about stability yet (no time and now I'm at work) but I had no problems with the basics.