I am also very impressed with the do stepping 920's

p6t
ocz 1333 6bg kit
running at 200x20 for 4ghz
air cooled

the SLBCH c0 stepping i have does this at 1.3v 75C max core temp

the first d0 stepping i put onto the same rig with same bios settings is running at 1.175v so far and it's prime stable at 68C max.