I have 3.2 on water with core temps maxing out at below 60C and can push 3.3 with ease at 64C but am having a few problems getting it stable. 3.6GHz is just out of my reach but I am not sure if its a board issue or a chip issue, I think it needs more volts on the FSB.
3.4 on water 24hr stable. I think there is a bit more room, but I'm going to have to fix the board cooling first (IP35 Pro). 100% passive cooling is just plain stupid. 3.6 is the goal.
I got my B3 Q6600 to 3.2 on the stock heatsink, but when i fired up Prime95 temps quickly went above 80C on all cores so I backed it down to 3.0. I got a Thermaltake Mini-Typhoon and was able to bump it up to 3.3. The heatsink still isn't great, and it still seems like my temperatures are a bit high. I can't really push the voltage until I get a better heatsink but I'm pretty happy with 3.3 right now.