I have one from NewEgg.

Batch # Q745A356
Pack Date - 12/27/07

I can get 450 x 9 with 1.35 vCore. (1.375 in Bios)

Anymore than that and it crashes, no matter the vCore, But I am pretty sure that is my memory holding it back. I have 4 gig (2 x 2gig) G.Skill 1006. It is at 900 mhz. Anymore than 950 mhz on the memory and the system crashes constantly. This is on a P5K Deluxe Board.