I've had my two Q6600s running at 3.51GHz reliably for over a year. I run the Zalman 9700 cooler, arctic silver, and a little arctic silver in between the gaps in the heat pipes and the copper block on the cooler. I also lapped my heat sinks and CPUs. Runs in the 30s, idle, can hit 69C on an all-day torture test of Prime95. Mainboard is GAP35DQ6.
