Add another $169 Q9550 from MicroCenter to the list. Got mine week before last. Batch L846B727, pack date 6/12/09. 4.0GHz OCCT Linpack stable @ 8.5x471 on Gigabyte P45-UD3L, 1.33-1.34V LLC enabled (1.375V in bios), MCH + 0.1V, VTT + 0.1V, all power-saving/thermal-throttling features disabled, all else stock. Shooting for 4.1-4.2GHz now that my A/C is working and it's not 80+ degrees Fahrenheit in the living room, as soon as my house guests leave and I have access to the PC again. I'll post relevant screenies as soon as I can.