I'm hoping that's 1.35V.
34C at idle sounds fine unless the room is cold. A Q6600's TDP is either 95W or 105W depedning on if the PCG is 05A or 05B.
An overheating Intel chip will do different things depending on what's active. Usually you will have throttling first. That wont lock the system up but it will get very slow. If the throttling function is disabled or there's a really big cooling problem the power will be removed from the processor. It will go right off, it wont reboot.