2600K SR00C - Stepping D2 - Batch L039B214
ASUS P8P67 Pro -- 1053 beta bios
Antec Earthwatts 650W
GSkill value DDR3-1333

OCCT 1 hr stable results (volts are bios settings):
Max BCLK tested - 107 (haven't had time to try higher, may not bother)

@ BCLK100 :
4.5 Ghz @ 1.30 volts (have not tried lower)
4.6 Ghz @ 1.32-1.33 volts (1.33 definitely stable, still running 1.32 test)
4.7 Ghz @ 1.36 volts
4.8 Ghz @ 1.38 volts
4.9 Ghz @ 1.40 volts
5.0 Ghz - locks immediately even at 1.40 volts - probably not going to try higher voltage

Cooling is (ancient, circa 2003) Koolance Exos 1/4" connector + Swiftech Apogee XT waterblock

I am thinking 4.6 ghz for 24/7 / gaming usage...